From 87f0388e84b6212ff7210d64a624da39933a2b4c Mon Sep 17 00:00:00 2001
From: Weston Ruter <weston@ruter.net>
Date: Mon, 22 Dec 2025 18:54:30 -0800
Subject: [PATCH] Use null coalescing operator for remaining uses of isset()

---
 src/wp-admin/edit-comments.php                |  4 ++--
 src/wp-admin/edit-form-advanced.php           |  2 +-
 src/wp-admin/includes/ajax-actions.php        | 10 +++++-----
 src/wp-admin/includes/class-core-upgrader.php |  2 +-
 .../includes/class-custom-image-header.php    |  6 +++---
 .../includes/class-plugin-installer-skin.php  |  6 +++---
 .../includes/class-plugin-upgrader.php        | 12 +++++------
 .../includes/class-theme-installer-skin.php   |  6 +++---
 .../includes/class-theme-upgrader.php         |  8 ++++----
 .../includes/class-wp-community-events.php    |  2 +-
 src/wp-admin/includes/class-wp-debug-data.php |  4 ++--
 .../includes/class-wp-links-list-table.php    |  2 +-
 .../includes/class-wp-media-list-table.php    |  2 +-
 .../class-wp-ms-themes-list-table.php         |  6 +++---
 .../includes/class-wp-ms-users-list-table.php |  2 +-
 .../class-wp-plugin-install-list-table.php    |  4 ++--
 .../includes/class-wp-terms-list-table.php    |  2 +-
 .../includes/class-wp-themes-list-table.php   |  2 +-
 .../includes/class-wp-users-list-table.php    |  4 ++--
 src/wp-admin/includes/credits.php             |  2 +-
 src/wp-admin/includes/image-edit.php          | 12 +++++------
 src/wp-admin/includes/meta-boxes.php          |  4 ++--
 src/wp-admin/includes/update-core.php         |  2 +-
 src/wp-admin/includes/update.php              |  8 ++++----
 src/wp-admin/includes/user.php                |  2 +-
 src/wp-admin/includes/widgets.php             | 16 +++++++--------
 src/wp-admin/link-parse-opml.php              |  6 +++---
 src/wp-admin/my-sites.php                     |  2 +-
 src/wp-admin/nav-menus.php                    |  2 +-
 src/wp-admin/network/site-themes.php          |  2 +-
 src/wp-admin/network/themes.php               |  2 +-
 src/wp-admin/network/upgrade.php              |  2 +-
 src/wp-admin/options-privacy.php              |  2 +-
 src/wp-admin/site-editor.php                  |  2 +-
 src/wp-admin/site-health.php                  |  2 +-
 src/wp-admin/update-core.php                  | 20 +++++++++----------
 src/wp-admin/update.php                       |  2 +-
 src/wp-admin/upload.php                       |  4 ++--
 src/wp-admin/users.php                        |  2 +-
 src/wp-admin/widgets-form.php                 |  8 ++++----
 src/wp-includes/script-loader.php             |  2 +-
 src/wp-signup.php                             |  4 ++--
 .../WPHTTP-testcase-redirection-script.php    |  6 +++---
 tests/phpunit/includes/abstract-testcase.php  |  2 +-
 .../class-wp-unittest-factory-for-term.php    |  2 +-
 tests/phpunit/includes/mock-fs.php            |  4 ++--
 .../tests/abilities-api/wpRegisterAbility.php | 10 +++++-----
 .../wpRegisterAbilityCategory.php             | 10 +++++-----
 .../tests/admin/wpPluginsListTable.php        |  2 +-
 .../tests/block-bindings/postMetaSource.php   |  2 +-
 tests/phpunit/tests/cron.php                  |  2 +-
 tests/phpunit/tests/dependencies/scripts.php  |  6 +++---
 .../filesystem/wpFilesystemDirect/base.php    |  2 +-
 .../wpRestFontFamiliesController.php          |  5 ++---
 .../phpunit/tests/general/wpResourceHints.php |  4 ++--
 .../wpInteractivityAPI-wp-router-region.php   |  2 +-
 .../tests/l10n/loadScriptTextdomain.php       |  2 +-
 tests/phpunit/tests/link/getAdjacentPost.php  |  4 ++--
 tests/phpunit/tests/oembed/controller.php     |  2 +-
 tests/phpunit/tests/post/thumbnails.php       |  4 ++--
 .../tests/rest-api/application-passwords.php  |  2 +-
 .../rest-pattern-directory-controller.php     |  2 +-
 .../tests/rest-api/rest-post-meta-fields.php  |  2 +-
 .../tests/rest-api/rest-term-meta-fields.php  |  2 +-
 tests/phpunit/tests/shortcode.php             |  2 +-
 65 files changed, 138 insertions(+), 139 deletions(-)

diff --git a/src/wp-admin/edit-comments.php b/src/wp-admin/edit-comments.php
index 8a004b52265ef..29ec964924a4d 100644
--- a/src/wp-admin/edit-comments.php
+++ b/src/wp-admin/edit-comments.php
@@ -337,7 +337,7 @@
 		}
 
 		if ( $spammed > 0 ) {
-			$ids = isset( $_REQUEST['ids'] ) ? $_REQUEST['ids'] : 0;
+			$ids = $_REQUEST['ids'] ?? 0;
 
 			$messages[] = sprintf(
 				/* translators: %s: Number of comments. */
@@ -359,7 +359,7 @@
 		}
 
 		if ( $trashed > 0 ) {
-			$ids = isset( $_REQUEST['ids'] ) ? $_REQUEST['ids'] : 0;
+			$ids = $_REQUEST['ids'] ?? 0;
 
 			$messages[] = sprintf(
 				/* translators: %s: Number of comments. */
diff --git a/src/wp-admin/edit-form-advanced.php b/src/wp-admin/edit-form-advanced.php
index 0380a48a9c735..a22acd74cc240 100644
--- a/src/wp-admin/edit-form-advanced.php
+++ b/src/wp-admin/edit-form-advanced.php
@@ -69,7 +69,7 @@
  */
 $post_ID = isset( $post_ID ) ? (int) $post_ID : 0;
 $user_ID = isset( $user_ID ) ? (int) $user_ID : 0;
-$action  = isset( $action ) ? $action : '';
+$action  = $action ?? '';
 
 if ( (int) get_option( 'page_for_posts' ) === $post->ID && empty( $post->post_content ) ) {
 	add_action( 'edit_form_after_title', '_wp_posts_page_notice' );
diff --git a/src/wp-admin/includes/ajax-actions.php b/src/wp-admin/includes/ajax-actions.php
index c3955b6d77cc6..2f3804a11b002 100644
--- a/src/wp-admin/includes/ajax-actions.php
+++ b/src/wp-admin/includes/ajax-actions.php
@@ -1808,7 +1808,7 @@ function wp_ajax_closed_postboxes() {
 	$hidden = isset( $_POST['hidden'] ) ? explode( ',', $_POST['hidden'] ) : array();
 	$hidden = array_filter( $hidden );
 
-	$page = isset( $_POST['page'] ) ? $_POST['page'] : '';
+	$page = $_POST['page'] ?? '';
 
 	if ( sanitize_key( $page ) !== $page ) {
 		wp_die( 0 );
@@ -1839,7 +1839,7 @@ function wp_ajax_closed_postboxes() {
  */
 function wp_ajax_hidden_columns() {
 	check_ajax_referer( 'screen-options-nonce', 'screenoptionnonce' );
-	$page = isset( $_POST['page'] ) ? $_POST['page'] : '';
+	$page = $_POST['page'] ?? '';
 
 	if ( sanitize_key( $page ) !== $page ) {
 		wp_die( 0 );
@@ -1988,13 +1988,13 @@ function wp_ajax_menu_locations_save() {
 function wp_ajax_meta_box_order() {
 	check_ajax_referer( 'meta-box-order' );
 	$order        = isset( $_POST['order'] ) ? (array) $_POST['order'] : false;
-	$page_columns = isset( $_POST['page_columns'] ) ? $_POST['page_columns'] : 'auto';
+	$page_columns = $_POST['page_columns'] ?? 'auto';
 
 	if ( 'auto' !== $page_columns ) {
 		$page_columns = (int) $page_columns;
 	}
 
-	$page = isset( $_POST['page'] ) ? $_POST['page'] : '';
+	$page = $_POST['page'] ?? '';
 
 	if ( sanitize_key( $page ) !== $page ) {
 		wp_die( 0 );
@@ -2052,7 +2052,7 @@ function wp_ajax_get_permalink() {
 function wp_ajax_sample_permalink() {
 	check_ajax_referer( 'samplepermalink', 'samplepermalinknonce' );
 	$post_id = isset( $_POST['post_id'] ) ? (int) $_POST['post_id'] : 0;
-	$title   = isset( $_POST['new_title'] ) ? $_POST['new_title'] : '';
+	$title   = $_POST['new_title'] ?? '';
 	$slug    = isset( $_POST['new_slug'] ) ? $_POST['new_slug'] : null;
 	wp_die( get_sample_permalink_html( $post_id, $title, $slug ) );
 }
diff --git a/src/wp-admin/includes/class-core-upgrader.php b/src/wp-admin/includes/class-core-upgrader.php
index 5cb818cd59bd2..184376654295e 100644
--- a/src/wp-admin/includes/class-core-upgrader.php
+++ b/src/wp-admin/includes/class-core-upgrader.php
@@ -403,7 +403,7 @@ public static function should_update_to_version( $offered_ver ) {
 	public function check_files() {
 		global $wp_version, $wp_local_package;
 
-		$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
+		$checksums = get_core_checksums( $wp_version, $wp_local_package ?? 'en_US' );
 
 		if ( ! is_array( $checksums ) ) {
 			return false;
diff --git a/src/wp-admin/includes/class-custom-image-header.php b/src/wp-admin/includes/class-custom-image-header.php
index e8a16e47dc80a..fc4ce68549afe 100644
--- a/src/wp-admin/includes/class-custom-image-header.php
+++ b/src/wp-admin/includes/class-custom-image-header.php
@@ -1351,7 +1351,7 @@ final public function create_attachment_object( $cropped, $parent_attachment_id
 	 * @return int Attachment ID.
 	 */
 	final public function insert_attachment( $attachment, $cropped ) {
-		$parent_id = isset( $attachment['post_parent'] ) ? $attachment['post_parent'] : null;
+		$parent_id = $attachment['post_parent'] ?? null;
 		unset( $attachment['post_parent'] );
 
 		$attachment_id = wp_insert_attachment( $attachment, $cropped );
@@ -1584,8 +1584,8 @@ public function get_uploaded_header_images() {
 
 		foreach ( $header_images as &$header_image ) {
 			$header_meta               = get_post_meta( $header_image['attachment_id'] );
-			$header_image['timestamp'] = isset( $header_meta[ $timestamp_key ] ) ? $header_meta[ $timestamp_key ] : '';
-			$header_image['alt_text']  = isset( $header_meta[ $alt_text_key ] ) ? $header_meta[ $alt_text_key ] : '';
+			$header_image['timestamp'] = $header_meta[ $timestamp_key ] ?? '';
+			$header_image['alt_text']  = $header_meta[ $alt_text_key ] ?? '';
 		}
 
 		return $header_images;
diff --git a/src/wp-admin/includes/class-plugin-installer-skin.php b/src/wp-admin/includes/class-plugin-installer-skin.php
index aa97833c59a85..13b4dd7097cc9 100644
--- a/src/wp-admin/includes/class-plugin-installer-skin.php
+++ b/src/wp-admin/includes/class-plugin-installer-skin.php
@@ -45,7 +45,7 @@ public function __construct( $args = array() ) {
 
 		$this->type      = $args['type'];
 		$this->url       = $args['url'];
-		$this->api       = isset( $args['api'] ) ? $args['api'] : array();
+		$this->api       = $args['api'] ?? array();
 		$this->overwrite = $args['overwrite'];
 
 		parent::__construct( $args );
@@ -265,8 +265,8 @@ private function do_overwrite() {
 		$blocked_message  = '<p>' . esc_html__( 'The plugin cannot be updated due to the following:' ) . '</p>';
 		$blocked_message .= '<ul class="ul-disc">';
 
-		$requires_php = isset( $new_plugin_data['RequiresPHP'] ) ? $new_plugin_data['RequiresPHP'] : null;
-		$requires_wp  = isset( $new_plugin_data['RequiresWP'] ) ? $new_plugin_data['RequiresWP'] : null;
+		$requires_php = $new_plugin_data['RequiresPHP'] ?? null;
+		$requires_wp  = $new_plugin_data['RequiresWP'] ?? null;
 
 		if ( ! is_php_version_compatible( $requires_php ) ) {
 			$error = sprintf(
diff --git a/src/wp-admin/includes/class-plugin-upgrader.php b/src/wp-admin/includes/class-plugin-upgrader.php
index 2f059b7e05887..f5290ff5258f6 100644
--- a/src/wp-admin/includes/class-plugin-upgrader.php
+++ b/src/wp-admin/includes/class-plugin-upgrader.php
@@ -490,8 +490,8 @@ public function check_package( $source ) {
 			return new WP_Error( 'incompatible_archive_no_plugins', $this->strings['incompatible_archive'], __( 'No valid plugins were found.' ) );
 		}
 
-		$requires_php = isset( $new_plugin_data['RequiresPHP'] ) ? $new_plugin_data['RequiresPHP'] : null;
-		$requires_wp  = isset( $new_plugin_data['RequiresWP'] ) ? $new_plugin_data['RequiresWP'] : null;
+		$requires_php = $new_plugin_data['RequiresPHP'] ?? null;
+		$requires_wp  = $new_plugin_data['RequiresWP'] ?? null;
 
 		if ( ! is_php_version_compatible( $requires_php ) ) {
 			$error = sprintf(
@@ -570,7 +570,7 @@ public function deactivate_plugin_before_upgrade( $response, $plugin ) {
 			return $response;
 		}
 
-		$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
+		$plugin = $plugin['plugin'] ?? '';
 		if ( empty( $plugin ) ) {
 			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
 		}
@@ -604,7 +604,7 @@ public function active_before( $response, $plugin ) {
 			return $response;
 		}
 
-		$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
+		$plugin = $plugin['plugin'] ?? '';
 
 		// Only run if plugin is active.
 		if ( ! is_plugin_active( $plugin ) ) {
@@ -640,7 +640,7 @@ public function active_after( $response, $plugin ) {
 			return $response;
 		}
 
-		$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
+		$plugin = $plugin['plugin'] ?? '';
 
 		// Only run if plugin is active.
 		if ( ! is_plugin_active( $plugin ) ) {
@@ -679,7 +679,7 @@ public function delete_old_plugin( $removed, $local_destination, $remote_destina
 			return $removed; // Pass errors through.
 		}
 
-		$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
+		$plugin = $plugin['plugin'] ?? '';
 		if ( empty( $plugin ) ) {
 			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
 		}
diff --git a/src/wp-admin/includes/class-theme-installer-skin.php b/src/wp-admin/includes/class-theme-installer-skin.php
index 7e734fce2f9db..81e40122d5bc5 100644
--- a/src/wp-admin/includes/class-theme-installer-skin.php
+++ b/src/wp-admin/includes/class-theme-installer-skin.php
@@ -45,7 +45,7 @@ public function __construct( $args = array() ) {
 
 		$this->type      = $args['type'];
 		$this->url       = $args['url'];
-		$this->api       = isset( $args['api'] ) ? $args['api'] : array();
+		$this->api       = $args['api'] ?? array();
 		$this->overwrite = $args['overwrite'];
 
 		parent::__construct( $args );
@@ -310,8 +310,8 @@ private function do_overwrite() {
 		$blocked_message  = '<p>' . esc_html__( 'The theme cannot be updated due to the following:' ) . '</p>';
 		$blocked_message .= '<ul class="ul-disc">';
 
-		$requires_php = isset( $new_theme_data['RequiresPHP'] ) ? $new_theme_data['RequiresPHP'] : null;
-		$requires_wp  = isset( $new_theme_data['RequiresWP'] ) ? $new_theme_data['RequiresWP'] : null;
+		$requires_php = $new_theme_data['RequiresPHP'] ?? null;
+		$requires_wp  = $new_theme_data['RequiresWP'] ?? null;
 
 		if ( ! is_php_version_compatible( $requires_php ) ) {
 			$error = sprintf(
diff --git a/src/wp-admin/includes/class-theme-upgrader.php b/src/wp-admin/includes/class-theme-upgrader.php
index 119f3c20f1c49..47062d3fd60dc 100644
--- a/src/wp-admin/includes/class-theme-upgrader.php
+++ b/src/wp-admin/includes/class-theme-upgrader.php
@@ -639,8 +639,8 @@ public function check_package( $source ) {
 			);
 		}
 
-		$requires_php = isset( $new_theme_data['RequiresPHP'] ) ? $new_theme_data['RequiresPHP'] : null;
-		$requires_wp  = isset( $new_theme_data['RequiresWP'] ) ? $new_theme_data['RequiresWP'] : null;
+		$requires_php = $new_theme_data['RequiresPHP'] ?? null;
+		$requires_wp  = $new_theme_data['RequiresWP'] ?? null;
 
 		if ( ! is_php_version_compatible( $requires_php ) ) {
 			$error = sprintf(
@@ -685,7 +685,7 @@ public function current_before( $response, $theme ) {
 			return $response;
 		}
 
-		$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';
+		$theme = $theme['theme'] ?? '';
 
 		// Only run if active theme.
 		if ( get_stylesheet() !== $theme ) {
@@ -717,7 +717,7 @@ public function current_after( $response, $theme ) {
 			return $response;
 		}
 
-		$theme = isset( $theme['theme'] ) ? $theme['theme'] : '';
+		$theme = $theme['theme'] ?? '';
 
 		// Only run if active theme.
 		if ( get_stylesheet() !== $theme ) {
diff --git a/src/wp-admin/includes/class-wp-community-events.php b/src/wp-admin/includes/class-wp-community-events.php
index b5a65e298df64..a31b3651b9a1c 100644
--- a/src/wp-admin/includes/class-wp-community-events.php
+++ b/src/wp-admin/includes/class-wp-community-events.php
@@ -122,7 +122,7 @@ public function get_events( $location_search = '', $timezone = '' ) {
 		} elseif ( ! isset( $response_body['location'], $response_body['events'] ) ) {
 			$response_error = new WP_Error(
 				'api-invalid-response',
-				isset( $response_body['error'] ) ? $response_body['error'] : __( 'Unknown API error.' )
+				$response_body['error'] ?? __( 'Unknown API error.' )
 			);
 		}
 
diff --git a/src/wp-admin/includes/class-wp-debug-data.php b/src/wp-admin/includes/class-wp-debug-data.php
index 9823396dd4d70..0ba82754f3eec 100644
--- a/src/wp-admin/includes/class-wp-debug-data.php
+++ b/src/wp-admin/includes/class-wp-debug-data.php
@@ -373,8 +373,8 @@ private static function get_wp_server(): array {
 		);
 		$fields['httpd_software']      = array(
 			'label' => __( 'Web server' ),
-			'value' => ( isset( $_SERVER['SERVER_SOFTWARE'] ) ? $_SERVER['SERVER_SOFTWARE'] : __( 'Unable to determine what web server software is used' ) ),
-			'debug' => ( isset( $_SERVER['SERVER_SOFTWARE'] ) ? $_SERVER['SERVER_SOFTWARE'] : 'unknown' ),
+			'value' => ( $_SERVER['SERVER_SOFTWARE'] ?? __( 'Unable to determine what web server software is used' ) ),
+			'debug' => ( $_SERVER['SERVER_SOFTWARE'] ?? 'unknown' ),
 		);
 		$fields['php_version']         = array(
 			'label' => __( 'PHP version' ),
diff --git a/src/wp-admin/includes/class-wp-links-list-table.php b/src/wp-admin/includes/class-wp-links-list-table.php
index b038f79a76b6c..744193e0ec4ae 100644
--- a/src/wp-admin/includes/class-wp-links-list-table.php
+++ b/src/wp-admin/includes/class-wp-links-list-table.php
@@ -29,7 +29,7 @@ public function __construct( $args = array() ) {
 		parent::__construct(
 			array(
 				'plural' => 'bookmarks',
-				'screen' => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen' => $args['screen'] ?? null,
 			)
 		);
 	}
diff --git a/src/wp-admin/includes/class-wp-media-list-table.php b/src/wp-admin/includes/class-wp-media-list-table.php
index 197fd96a9ca66..2604c394be2f0 100644
--- a/src/wp-admin/includes/class-wp-media-list-table.php
+++ b/src/wp-admin/includes/class-wp-media-list-table.php
@@ -47,7 +47,7 @@ public function __construct( $args = array() ) {
 		parent::__construct(
 			array(
 				'plural' => 'media',
-				'screen' => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen' => $args['screen'] ?? null,
 			)
 		);
 	}
diff --git a/src/wp-admin/includes/class-wp-ms-themes-list-table.php b/src/wp-admin/includes/class-wp-ms-themes-list-table.php
index 70187f44d446b..dd95834e91cc8 100644
--- a/src/wp-admin/includes/class-wp-ms-themes-list-table.php
+++ b/src/wp-admin/includes/class-wp-ms-themes-list-table.php
@@ -48,11 +48,11 @@ public function __construct( $args = array() ) {
 		parent::__construct(
 			array(
 				'plural' => 'themes',
-				'screen' => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen' => $args['screen'] ?? null,
 			)
 		);
 
-		$status = isset( $_REQUEST['theme_status'] ) ? $_REQUEST['theme_status'] : 'all';
+		$status = $_REQUEST['theme_status'] ?? 'all';
 		if ( ! in_array( $status, array( 'all', 'enabled', 'disabled', 'upgrade', 'search', 'broken', 'auto-update-enabled', 'auto-update-disabled' ), true ) ) {
 			$status = 'all';
 		}
@@ -153,7 +153,7 @@ public function prepare_items() {
 			$themes[ $filter ][ $key ] = $themes['all'][ $key ];
 
 			$theme_data = array(
-				'update_supported' => isset( $theme->update_supported ) ? $theme->update_supported : true,
+				'update_supported' => $theme->update_supported ?? true,
 			);
 
 			// Extra info if known. array_merge() ensures $theme_data has precedence if keys collide.
diff --git a/src/wp-admin/includes/class-wp-ms-users-list-table.php b/src/wp-admin/includes/class-wp-ms-users-list-table.php
index e7d0ad21ff577..b4cbf8457a0b4 100644
--- a/src/wp-admin/includes/class-wp-ms-users-list-table.php
+++ b/src/wp-admin/includes/class-wp-ms-users-list-table.php
@@ -41,7 +41,7 @@ public function prepare_items() {
 
 		$users_per_page = $this->get_items_per_page( 'users_network_per_page' );
 
-		$role = isset( $_REQUEST['role'] ) ? $_REQUEST['role'] : '';
+		$role = $_REQUEST['role'] ?? '';
 
 		$paged = $this->get_pagenum();
 
diff --git a/src/wp-admin/includes/class-wp-plugin-install-list-table.php b/src/wp-admin/includes/class-wp-plugin-install-list-table.php
index 3b772a739ed4c..1976dfa8aed28 100644
--- a/src/wp-admin/includes/class-wp-plugin-install-list-table.php
+++ b/src/wp-admin/includes/class-wp-plugin-install-list-table.php
@@ -556,8 +556,8 @@ public function display_rows() {
 				$author = ' <cite>' . sprintf( __( 'By %s' ), $author ) . '</cite>';
 			}
 
-			$requires_php = isset( $plugin['requires_php'] ) ? $plugin['requires_php'] : null;
-			$requires_wp  = isset( $plugin['requires'] ) ? $plugin['requires'] : null;
+			$requires_php = $plugin['requires_php'] ?? null;
+			$requires_wp  = $plugin['requires'] ?? null;
 
 			$compatible_php = is_php_version_compatible( $requires_php );
 			$compatible_wp  = is_wp_version_compatible( $requires_wp );
diff --git a/src/wp-admin/includes/class-wp-terms-list-table.php b/src/wp-admin/includes/class-wp-terms-list-table.php
index c624403d60eea..7537a499974d5 100644
--- a/src/wp-admin/includes/class-wp-terms-list-table.php
+++ b/src/wp-admin/includes/class-wp-terms-list-table.php
@@ -41,7 +41,7 @@ public function __construct( $args = array() ) {
 			array(
 				'plural'   => 'tags',
 				'singular' => 'tag',
-				'screen'   => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen'   => $args['screen'] ?? null,
 			)
 		);
 
diff --git a/src/wp-admin/includes/class-wp-themes-list-table.php b/src/wp-admin/includes/class-wp-themes-list-table.php
index d7c491bd1c79e..dbe880da0eacc 100644
--- a/src/wp-admin/includes/class-wp-themes-list-table.php
+++ b/src/wp-admin/includes/class-wp-themes-list-table.php
@@ -32,7 +32,7 @@ public function __construct( $args = array() ) {
 		parent::__construct(
 			array(
 				'ajax'   => true,
-				'screen' => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen' => $args['screen'] ?? null,
 			)
 		);
 	}
diff --git a/src/wp-admin/includes/class-wp-users-list-table.php b/src/wp-admin/includes/class-wp-users-list-table.php
index 8dfe3ce1a3e14..9a8709b438e05 100644
--- a/src/wp-admin/includes/class-wp-users-list-table.php
+++ b/src/wp-admin/includes/class-wp-users-list-table.php
@@ -46,7 +46,7 @@ public function __construct( $args = array() ) {
 			array(
 				'singular' => 'user',
 				'plural'   => 'users',
-				'screen'   => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen'   => $args['screen'] ?? null,
 			)
 		);
 
@@ -85,7 +85,7 @@ public function prepare_items() {
 
 		$usersearch = isset( $_REQUEST['s'] ) ? wp_unslash( trim( $_REQUEST['s'] ) ) : '';
 
-		$role = isset( $_REQUEST['role'] ) ? $_REQUEST['role'] : '';
+		$role = $_REQUEST['role'] ?? '';
 
 		$per_page       = ( $this->is_site_users ) ? 'site_users_network_per_page' : 'users_per_page';
 		$users_per_page = $this->get_items_per_page( $per_page );
diff --git a/src/wp-admin/includes/credits.php b/src/wp-admin/includes/credits.php
index 79b2a0b46c854..8a2b9375dc8fc 100644
--- a/src/wp-admin/includes/credits.php
+++ b/src/wp-admin/includes/credits.php
@@ -120,7 +120,7 @@ function wp_credits_section_title( $group_data = array() ) {
  * @param string $slug    The current group to display.
  */
 function wp_credits_section_list( $credits = array(), $slug = '' ) {
-	$group_data   = isset( $credits['groups'][ $slug ] ) ? $credits['groups'][ $slug ] : array();
+	$group_data   = $credits['groups'][ $slug ] ?? array();
 	$credits_data = $credits['data'];
 	if ( ! count( $group_data ) ) {
 		return;
diff --git a/src/wp-admin/includes/image-edit.php b/src/wp-admin/includes/image-edit.php
index e58262822594f..c933c2b7d2d96 100644
--- a/src/wp-admin/includes/image-edit.php
+++ b/src/wp-admin/includes/image-edit.php
@@ -109,8 +109,8 @@ function wp_image_editor( $post_id, $msg = false ) {
 			<input type="hidden" id="imgedit-history-<?php echo $post_id; ?>" value="" />
 			<input type="hidden" id="imgedit-undone-<?php echo $post_id; ?>" value="0" />
 			<input type="hidden" id="imgedit-selection-<?php echo $post_id; ?>" value="" />
-			<input type="hidden" id="imgedit-x-<?php echo $post_id; ?>" value="<?php echo isset( $meta['width'] ) ? $meta['width'] : 0; ?>" />
-			<input type="hidden" id="imgedit-y-<?php echo $post_id; ?>" value="<?php echo isset( $meta['height'] ) ? $meta['height'] : 0; ?>" />
+			<input type="hidden" id="imgedit-x-<?php echo $post_id; ?>" value="<?php echo $meta['width'] ?? 0; ?>" />
+			<input type="hidden" id="imgedit-y-<?php echo $post_id; ?>" value="<?php echo $meta['height'] ?? 0; ?>" />
 
 			<div id="imgedit-crop-<?php echo $post_id; ?>" class="imgedit-crop-wrap">
 			<div class="imgedit-crop-grid"></div>
@@ -154,10 +154,10 @@ function wp_image_editor( $post_id, $msg = false ) {
 							_e( 'scale height' );
 							?>
 							</label>
-							<input type="number" step="1" min="0" max="<?php echo isset( $meta['width'] ) ? $meta['width'] : ''; ?>" aria-describedby="imgedit-scale-warn-<?php echo $post_id; ?>"  id="imgedit-scale-width-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" value="<?php echo isset( $meta['width'] ) ? $meta['width'] : 0; ?>" />
+							<input type="number" step="1" min="0" max="<?php echo $meta['width'] ?? ''; ?>" aria-describedby="imgedit-scale-warn-<?php echo $post_id; ?>"  id="imgedit-scale-width-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 1, this)" value="<?php echo $meta['width'] ?? 0; ?>" />
 							<span class="imgedit-separator" aria-hidden="true">&times;</span>
 							<label for="imgedit-scale-height-<?php echo $post_id; ?>" class="screen-reader-text"><?php _e( 'scale height' ); ?></label>
-							<input type="number" step="1" min="0" max="<?php echo isset( $meta['height'] ) ? $meta['height'] : ''; ?>" aria-describedby="imgedit-scale-warn-<?php echo $post_id; ?>" id="imgedit-scale-height-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" value="<?php echo isset( $meta['height'] ) ? $meta['height'] : 0; ?>" />
+							<input type="number" step="1" min="0" max="<?php echo $meta['height'] ?? ''; ?>" aria-describedby="imgedit-scale-warn-<?php echo $post_id; ?>" id="imgedit-scale-height-<?php echo $post_id; ?>" onkeyup="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" onblur="imageEdit.scaleChanged(<?php echo $post_id; ?>, 0, this)" value="<?php echo $meta['height'] ?? 0; ?>" />
 							<button id="imgedit-scale-button" type="button" onclick="imageEdit.action(<?php echo "$post_id, '$nonce'"; ?>, 'scale')" class="button button-primary"><?php esc_html_e( 'Scale' ); ?></button>
 							</div>
 							<span class="imgedit-scale-warn" id="imgedit-scale-warn-<?php echo $post_id; ?>"><span class="dashicons dashicons-warning" aria-hidden="true"></span><?php esc_html_e( 'Images cannot be scaled to a size larger than the original.' ); ?></span>
@@ -744,10 +744,10 @@ function image_edit_apply_changes( $image, $changes ) {
 					$w    = $size['width'];
 					$h    = $size['height'];
 
-					$scale = isset( $sel->r ) ? $sel->r : 1 / _image_get_preview_ratio( $w, $h ); // Discard preview scaling.
+					$scale = $sel->r ?? 1 / _image_get_preview_ratio( $w, $h ); // Discard preview scaling.
 					$image->crop( (int) ( $sel->x * $scale ), (int) ( $sel->y * $scale ), (int) ( $sel->w * $scale ), (int) ( $sel->h * $scale ) );
 				} else {
-					$scale = isset( $sel->r ) ? $sel->r : 1 / _image_get_preview_ratio( imagesx( $image ), imagesy( $image ) ); // Discard preview scaling.
+					$scale = $sel->r ?? 1 / _image_get_preview_ratio( imagesx( $image ), imagesy( $image ) ); // Discard preview scaling.
 					$image = _crop_image_resource( $image, $sel->x * $scale, $sel->y * $scale, $sel->w * $scale, $sel->h * $scale );
 				}
 				break;
diff --git a/src/wp-admin/includes/meta-boxes.php b/src/wp-admin/includes/meta-boxes.php
index 52f43d0b685f4..cb2df14126004 100644
--- a/src/wp-admin/includes/meta-boxes.php
+++ b/src/wp-admin/includes/meta-boxes.php
@@ -1265,7 +1265,7 @@ function xfn_check( $xfn_relationship, $xfn_value = '', $deprecated = '' ) {
 		_deprecated_argument( __FUNCTION__, '2.5.0' ); // Never implemented.
 	}
 
-	$link_rel  = isset( $link->link_rel ) ? $link->link_rel : '';
+	$link_rel  = $link->link_rel ?? '';
 	$link_rels = preg_split( '/\s+/', $link_rel );
 
 	// Mark the specified value as checked if it matches the current link's relationship.
@@ -1454,7 +1454,7 @@ function link_advanced_meta_box( $link ) {
 	</tr>
 	<tr>
 		<th scope="row"><label for="link_notes"><?php _e( 'Notes' ); ?></label></th>
-		<td><textarea name="link_notes" id="link_notes" rows="10"><?php echo ( isset( $link->link_notes ) ? $link->link_notes : '' ); // textarea_escaped ?></textarea></td>
+		<td><textarea name="link_notes" id="link_notes" rows="10"><?php echo ( $link->link_notes ?? '' ); // textarea_escaped ?></textarea></td>
 	</tr>
 	<tr>
 		<th scope="row"><label for="link_rating"><?php _e( 'Rating' ); ?></label></th>
diff --git a/src/wp-admin/includes/update-core.php b/src/wp-admin/includes/update-core.php
index e417966c130fc..5d23c79384adb 100644
--- a/src/wp-admin/includes/update-core.php
+++ b/src/wp-admin/includes/update-core.php
@@ -1240,7 +1240,7 @@ function update_core( $from, $to ) {
 		// Find the local version of the working directory.
 		$working_dir_local = WP_CONTENT_DIR . '/upgrade/' . basename( $from ) . $distro;
 
-		$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
+		$checksums = get_core_checksums( $wp_version, $wp_local_package ?? 'en_US' );
 
 		if ( is_array( $checksums ) && isset( $checksums[ $wp_version ] ) ) {
 			$checksums = $checksums[ $wp_version ]; // Compat code for 3.7-beta2.
diff --git a/src/wp-admin/includes/update.php b/src/wp-admin/includes/update.php
index 33325236e3414..0fd9b3c79a5ff 100644
--- a/src/wp-admin/includes/update.php
+++ b/src/wp-admin/includes/update.php
@@ -470,7 +470,7 @@ function wp_plugin_update_row( $file, $plugin_data ) {
 	);
 
 	$plugin_name = wp_kses( $plugin_data['Name'], $plugins_allowedtags );
-	$plugin_slug = isset( $response->slug ) ? $response->slug : $response->id;
+	$plugin_slug = $response->slug ?? $response->id;
 
 	if ( isset( $response->slug ) ) {
 		$details_url = self_admin_url( 'plugin-install.php?tab=plugin-information&plugin=' . $plugin_slug . '&section=changelog' );
@@ -504,7 +504,7 @@ function wp_plugin_update_row( $file, $plugin_data ) {
 			$active_class = is_plugin_active( $file ) ? ' active' : '';
 		}
 
-		$requires_php   = isset( $response->requires_php ) ? $response->requires_php : null;
+		$requires_php   = $response->requires_php ?? null;
 		$compatible_php = is_php_version_compatible( $requires_php );
 		$notice_type    = $compatible_php ? 'notice-warning' : 'notice-error';
 
@@ -696,8 +696,8 @@ function wp_theme_update_row( $theme_key, $theme ) {
 
 	$active = $theme->is_allowed( 'network' ) ? ' active' : '';
 
-	$requires_wp  = isset( $response['requires'] ) ? $response['requires'] : null;
-	$requires_php = isset( $response['requires_php'] ) ? $response['requires_php'] : null;
+	$requires_wp  = $response['requires'] ?? null;
+	$requires_php = $response['requires_php'] ?? null;
 
 	$compatible_wp  = is_wp_version_compatible( $requires_wp );
 	$compatible_php = is_php_version_compatible( $requires_php );
diff --git a/src/wp-admin/includes/user.php b/src/wp-admin/includes/user.php
index f597cac132487..fed01c36b26eb 100644
--- a/src/wp-admin/includes/user.php
+++ b/src/wp-admin/includes/user.php
@@ -62,7 +62,7 @@ function edit_user( $user_id = 0 ) {
 			wp_die( __( 'Sorry, you are not allowed to give users that role.' ), 403 );
 		}
 
-		$potential_role = isset( $wp_roles->role_objects[ $new_role ] ) ? $wp_roles->role_objects[ $new_role ] : false;
+		$potential_role = $wp_roles->role_objects[ $new_role ] ?? false;
 
 		/*
 		 * Don't let anyone with 'promote_users' edit their own role to something without it.
diff --git a/src/wp-admin/includes/widgets.php b/src/wp-admin/includes/widgets.php
index 20cb5e159fe7b..450699ddb571b 100644
--- a/src/wp-admin/includes/widgets.php
+++ b/src/wp-admin/includes/widgets.php
@@ -137,7 +137,7 @@ function wp_list_widget_controls_dynamic_sidebar( $params ) {
 	++$i;
 
 	$widget_id = $params[0]['widget_id'];
-	$id        = isset( $params[0]['_temp_id'] ) ? $params[0]['_temp_id'] : $widget_id;
+	$id        = $params[0]['_temp_id'] ?? $widget_id;
 	$hidden    = isset( $params[0]['_hide'] ) ? ' style="display:none;"' : '';
 
 	$params[0]['before_widget'] = "<div id='widget-{$i}_{$id}' class='widget'$hidden>";
@@ -191,17 +191,17 @@ function wp_widget_control( $sidebar_args ) {
 	global $wp_registered_widgets, $wp_registered_widget_controls, $sidebars_widgets;
 
 	$widget_id  = $sidebar_args['widget_id'];
-	$sidebar_id = isset( $sidebar_args['id'] ) ? $sidebar_args['id'] : false;
+	$sidebar_id = $sidebar_args['id'] ?? false;
 	$key        = $sidebar_id ? array_search( $widget_id, $sidebars_widgets[ $sidebar_id ], true ) : '-1'; // Position of widget in sidebar.
-	$control    = isset( $wp_registered_widget_controls[ $widget_id ] ) ? $wp_registered_widget_controls[ $widget_id ] : array();
+	$control    = $wp_registered_widget_controls[ $widget_id ] ?? array();
 	$widget     = $wp_registered_widgets[ $widget_id ];
 
 	$id_format     = $widget['id'];
-	$widget_number = isset( $control['params'][0]['number'] ) ? $control['params'][0]['number'] : '';
-	$id_base       = isset( $control['id_base'] ) ? $control['id_base'] : $widget_id;
-	$width         = isset( $control['width'] ) ? $control['width'] : '';
-	$height        = isset( $control['height'] ) ? $control['height'] : '';
-	$multi_number  = isset( $sidebar_args['_multi_num'] ) ? $sidebar_args['_multi_num'] : '';
+	$widget_number = $control['params'][0]['number'] ?? '';
+	$id_base       = $control['id_base'] ?? $widget_id;
+	$width         = $control['width'] ?? '';
+	$height        = $control['height'] ?? '';
+	$multi_number  = $sidebar_args['_multi_num'] ?? '';
 	$add_new       = isset( $sidebar_args['_add'] ) ? $sidebar_args['_add'] : '';
 
 	$before_form           = isset( $sidebar_args['before_form'] ) ? $sidebar_args['before_form'] : '<form method="post">';
diff --git a/src/wp-admin/link-parse-opml.php b/src/wp-admin/link-parse-opml.php
index 513ed074dc7a6..ba31fbef83430 100644
--- a/src/wp-admin/link-parse-opml.php
+++ b/src/wp-admin/link-parse-opml.php
@@ -55,9 +55,9 @@ function startElement( $parser, $tag_name, $attrs ) { // phpcs:ignore WordPress.
 		// Save the data away.
 		$names[]        = $name;
 		$urls[]         = $url;
-		$targets[]      = isset( $attrs['TARGET'] ) ? $attrs['TARGET'] : '';
-		$feeds[]        = isset( $attrs['XMLURL'] ) ? $attrs['XMLURL'] : '';
-		$descriptions[] = isset( $attrs['DESCRIPTION'] ) ? $attrs['DESCRIPTION'] : '';
+		$targets[]      = $attrs['TARGET'] ?? '';
+		$feeds[]        = $attrs['XMLURL'] ?? '';
+		$descriptions[] = $attrs['DESCRIPTION'] ?? '';
 	} // End if outline.
 }
 
diff --git a/src/wp-admin/my-sites.php b/src/wp-admin/my-sites.php
index be7f63bb76391..71ebc3858ec34 100644
--- a/src/wp-admin/my-sites.php
+++ b/src/wp-admin/my-sites.php
@@ -17,7 +17,7 @@
 	wp_die( __( 'Sorry, you are not allowed to access this page.' ) );
 }
 
-$action = isset( $_POST['action'] ) ? $_POST['action'] : 'splash';
+$action = $_POST['action'] ?? 'splash';
 
 $blogs = get_blogs_of_user( $current_user->ID );
 
diff --git a/src/wp-admin/nav-menus.php b/src/wp-admin/nav-menus.php
index 5b1a48c123ab2..f42f51e2666fe 100644
--- a/src/wp-admin/nav-menus.php
+++ b/src/wp-admin/nav-menus.php
@@ -52,7 +52,7 @@
 $num_locations  = count( array_keys( $locations ) );
 
 // Allowed actions: add, update, delete.
-$action = isset( $_REQUEST['action'] ) ? $_REQUEST['action'] : 'edit';
+$action = $_REQUEST['action'] ?? 'edit';
 
 /*
  * If a JSON blob of navigation menu data is found, expand it and inject it
diff --git a/src/wp-admin/network/site-themes.php b/src/wp-admin/network/site-themes.php
index 0f2ddd5da9983..6276373f4df91 100644
--- a/src/wp-admin/network/site-themes.php
+++ b/src/wp-admin/network/site-themes.php
@@ -29,7 +29,7 @@
 
 $action = $wp_list_table->current_action();
 
-$s = isset( $_REQUEST['s'] ) ? $_REQUEST['s'] : '';
+$s = $_REQUEST['s'] ?? '';
 
 // Clean up request URI from temporary args for screen options/paging uri's to work as expected.
 $temp_args              = array( 'enabled', 'disabled', 'error' );
diff --git a/src/wp-admin/network/themes.php b/src/wp-admin/network/themes.php
index 9794c08f8f5e0..763a13712a59b 100644
--- a/src/wp-admin/network/themes.php
+++ b/src/wp-admin/network/themes.php
@@ -19,7 +19,7 @@
 
 $action = $wp_list_table->current_action();
 
-$s = isset( $_REQUEST['s'] ) ? $_REQUEST['s'] : '';
+$s = $_REQUEST['s'] ?? '';
 
 // Clean up request URI from temporary args for screen options/paging uri's to work as expected.
 $temp_args = array(
diff --git a/src/wp-admin/network/upgrade.php b/src/wp-admin/network/upgrade.php
index 79e40f45fbbc3..a3ff80c5829c6 100644
--- a/src/wp-admin/network/upgrade.php
+++ b/src/wp-admin/network/upgrade.php
@@ -47,7 +47,7 @@
 echo '<div class="wrap">';
 echo '<h1>' . __( 'Upgrade Network' ) . '</h1>';
 
-$action = isset( $_GET['action'] ) ? $_GET['action'] : 'show';
+$action = $_GET['action'] ?? 'show';
 
 switch ( $action ) {
 	case 'upgrade':
diff --git a/src/wp-admin/options-privacy.php b/src/wp-admin/options-privacy.php
index 33e59b4601175..4205967acb3a8 100644
--- a/src/wp-admin/options-privacy.php
+++ b/src/wp-admin/options-privacy.php
@@ -30,7 +30,7 @@ static function ( $body_class ) {
 	}
 );
 
-$action = isset( $_POST['action'] ) ? $_POST['action'] : '';
+$action = $_POST['action'] ?? '';
 
 get_current_screen()->add_help_tab(
 	array(
diff --git a/src/wp-admin/site-editor.php b/src/wp-admin/site-editor.php
index b0bb4e2bb1c10..628be6625369c 100644
--- a/src/wp-admin/site-editor.php
+++ b/src/wp-admin/site-editor.php
@@ -287,7 +287,7 @@ static function ( $classes ) {
 
 wp_add_inline_script(
 	'wp-blocks',
-	sprintf( 'wp.blocks.setCategories( %s );', wp_json_encode( isset( $editor_settings['blockCategories'] ) ? $editor_settings['blockCategories'] : array(), JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) ),
+	sprintf( 'wp.blocks.setCategories( %s );', wp_json_encode( $editor_settings['blockCategories'] ?? array(), JSON_HEX_TAG | JSON_UNESCAPED_SLASHES ) ),
 	'after'
 );
 
diff --git a/src/wp-admin/site-health.php b/src/wp-admin/site-health.php
index 2117aa1a750b1..87d585c563bf6 100644
--- a/src/wp-admin/site-health.php
+++ b/src/wp-admin/site-health.php
@@ -36,7 +36,7 @@
 	'tab-count-' . count( $tabs ),
 );
 
-$current_tab = ( isset( $_GET['tab'] ) ? $_GET['tab'] : '' );
+$current_tab = ( $_GET['tab'] ?? '' );
 
 $title = sprintf(
 	// translators: %s: The currently displayed tab.
diff --git a/src/wp-admin/update-core.php b/src/wp-admin/update-core.php
index 308f7e661fb3e..3148dbb34d5fa 100644
--- a/src/wp-admin/update-core.php
+++ b/src/wp-admin/update-core.php
@@ -542,7 +542,7 @@ function list_plugin_updates() {
 			}
 		}
 
-		$requires_php   = isset( $plugin_data->update->requires_php ) ? $plugin_data->update->requires_php : null;
+		$requires_php   = $plugin_data->update->requires_php ?? null;
 		$compatible_php = is_php_version_compatible( $requires_php );
 
 		if ( ! $compatible_php && current_user_can( 'update_php' ) ) {
@@ -687,8 +687,8 @@ function list_theme_updates() {
 	}
 
 	foreach ( $themes as $stylesheet => $theme ) {
-		$requires_wp  = isset( $theme->update['requires'] ) ? $theme->update['requires'] : null;
-		$requires_php = isset( $theme->update['requires_php'] ) ? $theme->update['requires_php'] : null;
+		$requires_wp  = $theme->update['requires'] ?? null;
+		$requires_php = $theme->update['requires_php'] ?? null;
 
 		$compatible_wp  = is_wp_version_compatible( $requires_wp );
 		$compatible_php = is_php_version_compatible( $requires_php );
@@ -854,8 +854,8 @@ function do_core_upgrade( $reinstall = false ) {
 	}
 	$url = wp_nonce_url( $url, 'upgrade-core' );
 
-	$version = isset( $_POST['version'] ) ? $_POST['version'] : false;
-	$locale  = isset( $_POST['locale'] ) ? $_POST['locale'] : 'en_US';
+	$version = $_POST['version'] ?? false;
+	$locale  = $_POST['locale'] ?? 'en_US';
 	$update  = find_core_update( $version, $locale );
 	if ( ! $update ) {
 		return;
@@ -947,8 +947,8 @@ function do_core_upgrade( $reinstall = false ) {
  * @since 2.7.0
  */
 function do_dismiss_core_update() {
-	$version = isset( $_POST['version'] ) ? $_POST['version'] : false;
-	$locale  = isset( $_POST['locale'] ) ? $_POST['locale'] : 'en_US';
+	$version = $_POST['version'] ?? false;
+	$locale  = $_POST['locale'] ?? 'en_US';
 	$update  = find_core_update( $version, $locale );
 	if ( ! $update ) {
 		return;
@@ -964,8 +964,8 @@ function do_dismiss_core_update() {
  * @since 2.7.0
  */
 function do_undismiss_core_update() {
-	$version = isset( $_POST['version'] ) ? $_POST['version'] : false;
-	$locale  = isset( $_POST['locale'] ) ? $_POST['locale'] : 'en_US';
+	$version = $_POST['version'] ?? false;
+	$locale  = $_POST['locale'] ?? 'en_US';
 	$update  = find_core_update( $version, $locale );
 	if ( ! $update ) {
 		return;
@@ -975,7 +975,7 @@ function do_undismiss_core_update() {
 	exit;
 }
 
-$action = isset( $_GET['action'] ) ? $_GET['action'] : 'upgrade-core';
+$action = $_GET['action'] ?? 'upgrade-core';
 
 $upgrade_error = false;
 if ( ( 'do-theme-upgrade' === $action || ( 'do-plugin-upgrade' === $action && ! isset( $_GET['plugins'] ) ) )
diff --git a/src/wp-admin/update.php b/src/wp-admin/update.php
index 090c37cfc4dfe..a6c59ec06dab2 100644
--- a/src/wp-admin/update.php
+++ b/src/wp-admin/update.php
@@ -22,7 +22,7 @@
 if ( isset( $_GET['action'] ) ) {
 	$plugin = isset( $_REQUEST['plugin'] ) ? trim( $_REQUEST['plugin'] ) : '';
 	$theme  = isset( $_REQUEST['theme'] ) ? urldecode( $_REQUEST['theme'] ) : '';
-	$action = isset( $_REQUEST['action'] ) ? $_REQUEST['action'] : '';
+	$action = $_REQUEST['action'] ?? '';
 
 	if ( 'update-selected' === $action ) {
 		if ( ! current_user_can( 'update_plugins' ) ) {
diff --git a/src/wp-admin/upload.php b/src/wp-admin/upload.php
index 7043dc279cf9c..1f42a287e4957 100644
--- a/src/wp-admin/upload.php
+++ b/src/wp-admin/upload.php
@@ -87,7 +87,7 @@
 
 	$message .= sprintf(
 		' <a href="%1$s">%2$s</a>',
-		esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids=' . ( isset( $_GET['ids'] ) ? $_GET['ids'] : '' ), 'bulk-media' ) ),
+		esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids=' . ( $_GET['ids'] ?? '' ), 'bulk-media' ) ),
 		__( 'Undo' )
 	);
 
@@ -117,7 +117,7 @@
 $messages[3] = __( 'Error saving media file.' );
 $messages[4] = __( 'Media file moved to the Trash.' ) . sprintf(
 	' <a href="%1$s">%2$s</a>',
-	esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids=' . ( isset( $_GET['ids'] ) ? $_GET['ids'] : '' ), 'bulk-media' ) ),
+	esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids=' . ( $_GET['ids'] ?? '' ), 'bulk-media' ) ),
 	__( 'Undo' )
 );
 $messages[5] = __( 'Media file restored from the Trash.' );
diff --git a/src/wp-admin/users.php b/src/wp-admin/users.php
index 60cf94b6ffdd2..6f41bacb8c6b8 100644
--- a/src/wp-admin/users.php
+++ b/src/wp-admin/users.php
@@ -629,7 +629,7 @@
 					break;
 				case 'add':
 					$message = __( 'New user created.' );
-					$user_id = isset( $_GET['id'] ) ? $_GET['id'] : false;
+					$user_id = $_GET['id'] ?? false;
 					if ( $user_id && current_user_can( 'edit_user', $user_id ) ) {
 						$message .= sprintf(
 							' <a href="%1$s">%2$s</a>',
diff --git a/src/wp-admin/widgets-form.php b/src/wp-admin/widgets-form.php
index cde09ca47c115..0f841d90434d6 100644
--- a/src/wp-admin/widgets-form.php
+++ b/src/wp-admin/widgets-form.php
@@ -139,7 +139,7 @@
 	$position   = isset( $_POST[ $sidebar_id . '_position' ] ) ? (int) $_POST[ $sidebar_id . '_position' ] - 1 : 0;
 
 	$id_base = $_POST['id_base'];
-	$sidebar = isset( $sidebars_widgets[ $sidebar_id ] ) ? $sidebars_widgets[ $sidebar_id ] : array();
+	$sidebar = $sidebars_widgets[ $sidebar_id ] ?? array();
 
 	// Delete.
 	if ( isset( $_POST['removewidget'] ) && $_POST['removewidget'] ) {
@@ -261,14 +261,14 @@
 	}
 
 	if ( ! isset( $sidebar ) ) {
-		$sidebar = isset( $_GET['sidebar'] ) ? $_GET['sidebar'] : 'wp_inactive_widgets';
+		$sidebar = $_GET['sidebar'] ?? 'wp_inactive_widgets';
 	}
 
 	if ( ! isset( $multi_number ) ) {
-		$multi_number = isset( $control['params'][0]['number'] ) ? $control['params'][0]['number'] : '';
+		$multi_number = $control['params'][0]['number'] ?? '';
 	}
 
-	$id_base = isset( $control['id_base'] ) ? $control['id_base'] : $control['id'];
+	$id_base = $control['id_base'] ?? $control['id'];
 
 	// Show the widget form.
 	$width = ' style="width:' . max( $control['width'], 350 ) . 'px"';
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 56986c3d80a79..93b0ec541c97c 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -2027,7 +2027,7 @@ function wp_localize_community_events() {
 
 	$user_id            = get_current_user_id();
 	$saved_location     = get_user_option( 'community-events-location', $user_id );
-	$saved_ip_address   = isset( $saved_location['ip'] ) ? $saved_location['ip'] : false;
+	$saved_ip_address   = $saved_location['ip'] ?? false;
 	$current_ip_address = WP_Community_Events::get_unsafe_client_ip();
 
 	/*
diff --git a/src/wp-signup.php b/src/wp-signup.php
index 0508d01c50df5..6daee76ae6c1b 100644
--- a/src/wp-signup.php
+++ b/src/wp-signup.php
@@ -976,7 +976,7 @@ function signup_get_available_languages() {
 	/* translators: %s: Login URL. */
 	printf( __( 'You must first <a href="%s">log in</a>, and then you can create a new site.' ), $login_url );
 } else {
-	$stage = isset( $_POST['stage'] ) ? $_POST['stage'] : 'default';
+	$stage = $_POST['stage'] ?? 'default';
 	switch ( $stage ) {
 		case 'validate-user-signup':
 			if ( 'all' === $active_signup
@@ -1000,7 +1000,7 @@ function signup_get_available_languages() {
 			break;
 		case 'default':
 		default:
-			$user_email = isset( $_POST['user_email'] ) ? $_POST['user_email'] : '';
+			$user_email = $_POST['user_email'] ?? '';
 			/**
 			 * Fires when the site sign-up form is sent.
 			 *
diff --git a/tests/phpunit/data/WPHTTP-testcase-redirection-script.php b/tests/phpunit/data/WPHTTP-testcase-redirection-script.php
index 94643d3de9c43..6b535a45c36bb 100644
--- a/tests/phpunit/data/WPHTTP-testcase-redirection-script.php
+++ b/tests/phpunit/data/WPHTTP-testcase-redirection-script.php
@@ -54,7 +54,7 @@ function is_ssl() {
 
 if ( isset( $_GET['post-redirect-to-method'] ) ) {
 	$method = $_SERVER['REQUEST_METHOD'];
-	$response_code = isset( $_GET['response_code'] ) ? $_GET['response_code'] : 301;
+	$response_code = $_GET['response_code'] ?? 301;
 
 	if ( 'POST' == $method && ! isset( $_GET['redirection-performed'] ) ) {
 		header( "Location: $url?post-redirect-to-method=1&redirection-performed=1", true, $response_code );
@@ -123,8 +123,8 @@ function is_ssl() {
 }
 
 
-$rt = isset($_GET['rt']) ? $_GET['rt'] : 5;
-$r = isset($_GET['r']) ? $_GET['r'] : 0;
+$rt = $_GET['rt'] ?? 5;
+$r = $_GET['r'] ?? 0;
 
 if ( $r < $rt ) {
 	$code = isset($_GET['code']) ? (int)$_GET['code'] : 302;
diff --git a/tests/phpunit/includes/abstract-testcase.php b/tests/phpunit/includes/abstract-testcase.php
index 5b080fc7ceb9f..35bf18f688feb 100644
--- a/tests/phpunit/includes/abstract-testcase.php
+++ b/tests/phpunit/includes/abstract-testcase.php
@@ -1313,7 +1313,7 @@ public function go_to( $url ) {
 		}
 		$parts = parse_url( $url );
 		if ( isset( $parts['scheme'] ) ) {
-			$req = isset( $parts['path'] ) ? $parts['path'] : '';
+			$req = $parts['path'] ?? '';
 			if ( isset( $parts['query'] ) ) {
 				$req .= '?' . $parts['query'];
 				// Parse the URL query vars into $_GET.
diff --git a/tests/phpunit/includes/factory/class-wp-unittest-factory-for-term.php b/tests/phpunit/includes/factory/class-wp-unittest-factory-for-term.php
index ee082b3f97de1..6b2b7340df176 100644
--- a/tests/phpunit/includes/factory/class-wp-unittest-factory-for-term.php
+++ b/tests/phpunit/includes/factory/class-wp-unittest-factory-for-term.php
@@ -109,7 +109,7 @@ public function create_and_get( $args = array(), $generation_definitions = null
 			return $term_id;
 		}
 
-		$taxonomy = isset( $args['taxonomy'] ) ? $args['taxonomy'] : $this->taxonomy;
+		$taxonomy = $args['taxonomy'] ?? $this->taxonomy;
 
 		return get_term( $term_id, $taxonomy );
 	}
diff --git a/tests/phpunit/includes/mock-fs.php b/tests/phpunit/includes/mock-fs.php
index 40705dc41141d..5a54e49039a21 100644
--- a/tests/phpunit/includes/mock-fs.php
+++ b/tests/phpunit/includes/mock-fs.php
@@ -46,7 +46,7 @@ public function init( $paths = '', $home_dir = '/' ) {
 			'/' => $this->fs,
 		);
 		$this->cache  = array(); // Used by find_folder() and friends.
-		$this->cwd    = isset( $this->fs_map[ $home_dir ] ) ? $this->fs_map[ $home_dir ] : '/';
+		$this->cwd    = $this->fs_map[ $home_dir ] ?? '/';
 		$this->setfs( $paths );
 	}
 
@@ -79,7 +79,7 @@ public function setfs( $paths ) {
 	 * Locates a filesystem "node"
 	 */
 	private function locate_node( $path ) {
-		return isset( $this->fs_map[ $path ] ) ? $this->fs_map[ $path ] : false;
+		return $this->fs_map[ $path ] ?? false;
 	}
 
 	/**
diff --git a/tests/phpunit/tests/abilities-api/wpRegisterAbility.php b/tests/phpunit/tests/abilities-api/wpRegisterAbility.php
index d07de062e12b2..61bf8f59dba53 100644
--- a/tests/phpunit/tests/abilities-api/wpRegisterAbility.php
+++ b/tests/phpunit/tests/abilities-api/wpRegisterAbility.php
@@ -154,7 +154,7 @@ public function test_register_ability_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -450,7 +450,7 @@ public function test_unregister_ability_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -496,7 +496,7 @@ public function test_get_ability_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -559,7 +559,7 @@ public function test_has_ability_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -615,7 +615,7 @@ public function test_get_abilities_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
diff --git a/tests/phpunit/tests/abilities-api/wpRegisterAbilityCategory.php b/tests/phpunit/tests/abilities-api/wpRegisterAbilityCategory.php
index 169ea287d5e80..5a59b1050bf25 100644
--- a/tests/phpunit/tests/abilities-api/wpRegisterAbilityCategory.php
+++ b/tests/phpunit/tests/abilities-api/wpRegisterAbilityCategory.php
@@ -82,7 +82,7 @@ public function test_register_ability_category_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -132,7 +132,7 @@ public function test_unregister_ability_category_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -194,7 +194,7 @@ public function test_has_ability_category_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -255,7 +255,7 @@ public function test_get_ability_category_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
@@ -328,7 +328,7 @@ public function test_get_ability_categories_no_init_action(): void {
 		global $wp_actions;
 
 		// Store the original action count.
-		$original_count = isset( $wp_actions['init'] ) ? $wp_actions['init'] : 0;
+		$original_count = $wp_actions['init'] ?? 0;
 
 		// Reset the action count to simulate it not being fired.
 		unset( $wp_actions['init'] );
diff --git a/tests/phpunit/tests/admin/wpPluginsListTable.php b/tests/phpunit/tests/admin/wpPluginsListTable.php
index e75a473e2ba82..daa54750fdf9e 100644
--- a/tests/phpunit/tests/admin/wpPluginsListTable.php
+++ b/tests/phpunit/tests/admin/wpPluginsListTable.php
@@ -137,7 +137,7 @@ public function test_get_views_should_return_views_by_default() {
 	 * @param string $status The value for $_REQUEST['plugin_status'].
 	 */
 	public function test_construct_should_not_set_show_autoupdates_to_false_for_mustuse_and_dropins( $status ) {
-		$original_status           = isset( $_REQUEST['plugin_status'] ) ? $_REQUEST['plugin_status'] : null;
+		$original_status           = $_REQUEST['plugin_status'] ?? null;
 		$_REQUEST['plugin_status'] = $status;
 
 		// Enable plugin auto-updates.
diff --git a/tests/phpunit/tests/block-bindings/postMetaSource.php b/tests/phpunit/tests/block-bindings/postMetaSource.php
index 0a305314b7869..927d290f80557 100644
--- a/tests/phpunit/tests/block-bindings/postMetaSource.php
+++ b/tests/phpunit/tests/block-bindings/postMetaSource.php
@@ -28,7 +28,7 @@ private function get_modified_post_content( $content ) {
 	 */
 	public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
 		self::$post               = $factory->post->create_and_get();
-		self::$wp_meta_keys_saved = isset( $GLOBALS['wp_meta_keys'] ) ? $GLOBALS['wp_meta_keys'] : array();
+		self::$wp_meta_keys_saved = $GLOBALS['wp_meta_keys'] ?? array();
 	}
 
 	/**
diff --git a/tests/phpunit/tests/cron.php b/tests/phpunit/tests/cron.php
index f79772074fc83..7abaf5c92095e 100644
--- a/tests/phpunit/tests/cron.php
+++ b/tests/phpunit/tests/cron.php
@@ -460,7 +460,7 @@ public function filter_pre_schedule_event_filter( $result, $event ) {
 
 		$this->preflight_cron_array[ $event->timestamp ][ $event->hook ][ $key ] = array(
 			'schedule' => $event->schedule,
-			'interval' => isset( $event->interval ) ? $event->interval : 0,
+			'interval' => $event->interval ?? 0,
 			'args'     => $event->args,
 		);
 		uksort( $this->preflight_cron_array, 'strnatcasecmp' );
diff --git a/tests/phpunit/tests/dependencies/scripts.php b/tests/phpunit/tests/dependencies/scripts.php
index 5975149a6e675..a444c3c5d584c 100644
--- a/tests/phpunit/tests/dependencies/scripts.php
+++ b/tests/phpunit/tests/dependencies/scripts.php
@@ -37,9 +37,9 @@ class Tests_Dependencies_Scripts extends WP_UnitTestCase {
 
 	public function set_up() {
 		parent::set_up();
-		$this->old_wp_scripts          = isset( $GLOBALS['wp_scripts'] ) ? $GLOBALS['wp_scripts'] : null;
-		$this->old_wp_styles           = isset( $GLOBALS['wp_styles'] ) ? $GLOBALS['wp_styles'] : null;
-		$this->old_concatenate_scripts = isset( $GLOBALS['concatenate_scripts'] ) ? $GLOBALS['concatenate_scripts'] : null;
+		$this->old_wp_scripts          = $GLOBALS['wp_scripts'] ?? null;
+		$this->old_wp_styles           = $GLOBALS['wp_styles'] ?? null;
+		$this->old_concatenate_scripts = $GLOBALS['concatenate_scripts'] ?? null;
 		remove_action( 'wp_default_scripts', 'wp_default_scripts' );
 		remove_action( 'wp_default_scripts', 'wp_default_packages' );
 		$GLOBALS['wp_scripts']                  = new WP_Scripts();
diff --git a/tests/phpunit/tests/filesystem/wpFilesystemDirect/base.php b/tests/phpunit/tests/filesystem/wpFilesystemDirect/base.php
index 97165de5c88df..96b449dd0306a 100644
--- a/tests/phpunit/tests/filesystem/wpFilesystemDirect/base.php
+++ b/tests/phpunit/tests/filesystem/wpFilesystemDirect/base.php
@@ -90,7 +90,7 @@ public function set_up() {
 			} elseif ( 'f' === $entry['type'] ) {
 				$this->create_file_if_needed(
 					$entry['path'],
-					isset( $entry['contents'] ) ? $entry['contents'] : ''
+					$entry['contents'] ?? ''
 				);
 			}
 		}
diff --git a/tests/phpunit/tests/fonts/font-library/wpRestFontFamiliesController.php b/tests/phpunit/tests/fonts/font-library/wpRestFontFamiliesController.php
index ef1ced421c25e..9b845cba68e1d 100644
--- a/tests/phpunit/tests/fonts/font-library/wpRestFontFamiliesController.php
+++ b/tests/phpunit/tests/fonts/font-library/wpRestFontFamiliesController.php
@@ -1048,9 +1048,8 @@ protected function check_font_family_data( $data, $post_id, $links ) {
 			$expected = rest_url( 'wp/v2/font-families/' . $post->ID . '/font-faces/' . $font_face_ids[ $index ] );
 			$this->assertSame( $expected, $link['href'], 'The links for a font faces URL from the response data should match the REST endpoint.' );
 
-			$embeddable = isset( $link['attributes']['embeddable'] )
-				? $link['attributes']['embeddable']
-				: $link['embeddable'];
+			$embeddable = $link['attributes']['embeddable']
+				?? $link['embeddable'];
 			$this->assertTrue( $embeddable, 'The embeddable should be true.' );
 		}
 	}
diff --git a/tests/phpunit/tests/general/wpResourceHints.php b/tests/phpunit/tests/general/wpResourceHints.php
index d0ece5d9ac874..3b546dc6e254e 100644
--- a/tests/phpunit/tests/general/wpResourceHints.php
+++ b/tests/phpunit/tests/general/wpResourceHints.php
@@ -12,8 +12,8 @@ class Tests_General_wpResourceHints extends WP_UnitTestCase {
 
 	public function set_up() {
 		parent::set_up();
-		$this->old_wp_scripts = isset( $GLOBALS['wp_scripts'] ) ? $GLOBALS['wp_scripts'] : null;
-		$this->old_wp_styles  = isset( $GLOBALS['wp_styles'] ) ? $GLOBALS['wp_styles'] : null;
+		$this->old_wp_scripts = $GLOBALS['wp_scripts'] ?? null;
+		$this->old_wp_styles  = $GLOBALS['wp_styles'] ?? null;
 
 		remove_action( 'wp_default_scripts', 'wp_default_scripts' );
 		remove_action( 'wp_default_styles', 'wp_default_styles' );
diff --git a/tests/phpunit/tests/interactivity-api/wpInteractivityAPI-wp-router-region.php b/tests/phpunit/tests/interactivity-api/wpInteractivityAPI-wp-router-region.php
index d6deab48ab141..f5e5e3a62d37c 100644
--- a/tests/phpunit/tests/interactivity-api/wpInteractivityAPI-wp-router-region.php
+++ b/tests/phpunit/tests/interactivity-api/wpInteractivityAPI-wp-router-region.php
@@ -45,7 +45,7 @@ public function set_up() {
 		$wp_filter['wp_footer']   = new WP_Hook();
 
 		// Removes all registered styles.
-		$this->original_wp_styles = isset( $GLOBALS['wp_styles'] ) ? $GLOBALS['wp_styles'] : null;
+		$this->original_wp_styles = $GLOBALS['wp_styles'] ?? null;
 		$GLOBALS['wp_styles']     = new WP_Styles();
 		remove_action( 'wp_default_styles', 'wp_default_styles' );
 		remove_action( 'wp_print_styles', 'print_emoji_styles' );
diff --git a/tests/phpunit/tests/l10n/loadScriptTextdomain.php b/tests/phpunit/tests/l10n/loadScriptTextdomain.php
index bc028fbfa5e4d..7aedd92cc666c 100644
--- a/tests/phpunit/tests/l10n/loadScriptTextdomain.php
+++ b/tests/phpunit/tests/l10n/loadScriptTextdomain.php
@@ -20,7 +20,7 @@ class Tests_L10n_LoadScriptTextdomain extends WP_UnitTestCase {
 	 */
 	public function test_resolve_relative_path( $translation_path, $handle, $src, $textdomain, $filter = array() ) {
 		if ( ! empty( $filter ) ) {
-			add_filter( $filter[0], $filter[1], 10, isset( $filter[2] ) ? $filter[2] : 1 );
+			add_filter( $filter[0], $filter[1], 10, $filter[2] ?? 1 );
 		}
 		wp_enqueue_script( $handle, $src, array(), null );
 
diff --git a/tests/phpunit/tests/link/getAdjacentPost.php b/tests/phpunit/tests/link/getAdjacentPost.php
index 4d68493bfe8de..7fdd06ec75ead 100644
--- a/tests/phpunit/tests/link/getAdjacentPost.php
+++ b/tests/phpunit/tests/link/getAdjacentPost.php
@@ -192,7 +192,7 @@ public function test_get_adjacent_post_excluded_terms() {
 		wp_set_post_terms( $p2, array( $t ), 'wptests_tax' );
 
 		// Fake current page.
-		$_post           = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : null;
+		$_post           = $GLOBALS['post'] ?? null;
 		$GLOBALS['post'] = get_post( $p1 );
 
 		$found = get_adjacent_post( false, array( $t ), true, 'wptests_tax' );
@@ -229,7 +229,7 @@ public function test_get_adjacent_post_excluded_terms_should_not_require_posts_t
 		wp_delete_object_term_relationships( $p3, 'category' );
 
 		// Fake current page.
-		$_post           = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : null;
+		$_post           = $GLOBALS['post'] ?? null;
 		$GLOBALS['post'] = get_post( $p1 );
 
 		$found = get_adjacent_post( false, array( $t ), true, 'wptests_tax' );
diff --git a/tests/phpunit/tests/oembed/controller.php b/tests/phpunit/tests/oembed/controller.php
index aa0275c4c87ee..c8d9f00af05e7 100644
--- a/tests/phpunit/tests/oembed/controller.php
+++ b/tests/phpunit/tests/oembed/controller.php
@@ -93,7 +93,7 @@ public function mock_embed_request( $response, $parsed_args, $url ) {
 		unset( $response, $parsed_args );
 
 		$parsed_url = wp_parse_url( $url );
-		$query      = isset( $parsed_url['query'] ) ? $parsed_url['query'] : '';
+		$query      = $parsed_url['query'] ?? '';
 		parse_str( $query, $query_params );
 		$this->request_count += 1;
 
diff --git a/tests/phpunit/tests/post/thumbnails.php b/tests/phpunit/tests/post/thumbnails.php
index 8f596cbe7f679..4c4885b00b23e 100644
--- a/tests/phpunit/tests/post/thumbnails.php
+++ b/tests/phpunit/tests/post/thumbnails.php
@@ -287,7 +287,7 @@ public function test_the_post_thumbnail_url() {
 	 * @ticket 12922
 	 */
 	public function test__wp_preview_post_thumbnail_filter() {
-		$old_post = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : null;
+		$old_post = $GLOBALS['post'] ?? null;
 
 		$GLOBALS['post']           = self::$post;
 		$_REQUEST['_thumbnail_id'] = self::$attachment_id;
@@ -307,7 +307,7 @@ public function test__wp_preview_post_thumbnail_filter() {
 	 * @ticket 37697
 	 */
 	public function test__wp_preview_post_thumbnail_filter_secondary_post() {
-		$old_post = isset( $GLOBALS['post'] ) ? $GLOBALS['post'] : null;
+		$old_post = $GLOBALS['post'] ?? null;
 
 		$secondary_post = self::factory()->post->create(
 			array(
diff --git a/tests/phpunit/tests/rest-api/application-passwords.php b/tests/phpunit/tests/rest-api/application-passwords.php
index 3dd76c0f94d61..65e3bf222d85f 100644
--- a/tests/phpunit/tests/rest-api/application-passwords.php
+++ b/tests/phpunit/tests/rest-api/application-passwords.php
@@ -154,7 +154,7 @@ public function test_update_application_password( array $update, array $existing
 		// Check updated only given values.
 		$updated_item = WP_Application_Passwords::get_user_application_password( self::$user_id, $uuid );
 		foreach ( $updated_item as $key => $update_value ) {
-			$expected_value = isset( $update[ $key ] ) ? $update[ $key ] : $original_item[ $key ];
+			$expected_value = $update[ $key ] ?? $original_item[ $key ];
 			$this->assertSame( $expected_value, $update_value );
 		}
 	}
diff --git a/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php b/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
index 038994cdd1183..6f84306dad61f 100644
--- a/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-pattern-directory-controller.php
@@ -82,7 +82,7 @@ public function tear_down() {
 	 */
 	public function assertPatternMatchesSchema( $pattern ) {
 		$schema     = static::$controller->get_item_schema();
-		$pattern_id = isset( $pattern->id ) ? $pattern->id : '{pattern ID is missing}';
+		$pattern_id = $pattern->id ?? '{pattern ID is missing}';
 
 		$this->assertTrue(
 			rest_validate_value_from_schema( $pattern, $schema ),
diff --git a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
index 47eada094d0ee..5ce72a57fa55f 100644
--- a/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-post-meta-fields.php
@@ -21,7 +21,7 @@ public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
 			)
 		);
 
-		self::$wp_meta_keys_saved = isset( $GLOBALS['wp_meta_keys'] ) ? $GLOBALS['wp_meta_keys'] : array();
+		self::$wp_meta_keys_saved = $GLOBALS['wp_meta_keys'] ?? array();
 		self::$post_id            = $factory->post->create();
 		self::$cpt_post_id        = $factory->post->create( array( 'post_type' => 'cpt' ) );
 	}
diff --git a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
index 8d4ba295f87a5..737fa90d84633 100644
--- a/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
+++ b/tests/phpunit/tests/rest-api/rest-term-meta-fields.php
@@ -21,7 +21,7 @@ public static function wpSetUpBeforeClass( WP_UnitTest_Factory $factory ) {
 			)
 		);
 
-		self::$wp_meta_keys_saved = isset( $GLOBALS['wp_meta_keys'] ) ? $GLOBALS['wp_meta_keys'] : array();
+		self::$wp_meta_keys_saved = $GLOBALS['wp_meta_keys'] ?? array();
 		self::$category_id        = $factory->category->create();
 		self::$customtax_term_id  = $factory->term->create( array( 'taxonomy' => 'customtax' ) );
 	}
diff --git a/tests/phpunit/tests/shortcode.php b/tests/phpunit/tests/shortcode.php
index 269da2b05e34d..7467d1ed7e6a3 100644
--- a/tests/phpunit/tests/shortcode.php
+++ b/tests/phpunit/tests/shortcode.php
@@ -48,7 +48,7 @@ public function shortcode_test_shortcode_tag( $atts, $content = null, $tagname =
 
 	// [footag foo="bar"]
 	public function shortcode_footag( $atts ) {
-		$foo = isset( $atts['foo'] ) ? $atts['foo'] : '';
+		$foo = $atts['foo'] ?? '';
 		return "foo = $foo";
 	}