Use null coalescing operator (??) for remaining instances of isset() ternaries

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 );
@@ -2052,8 +2052,8 @@ 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'] : '';
-	$slug    = isset( $_POST['new_slug'] ) ? $_POST['new_slug'] : null;
+	$title   = $_POST['new_title'] ?? '';
+	$slug    = $_POST['new_slug'] ?? null;
 	wp_die( get_sample_permalink_html( $post_id, $title, $slug ) );
 }
 
@@ -2393,7 +2393,7 @@ function wp_ajax_save_widget() {
 	$error        = '<p>' . __( 'An error has occurred. Please reload the page and try again.' ) . '</p>';
 
 	$sidebars = wp_get_sidebars_widgets();
-	$sidebar  = isset( $sidebars[ $sidebar_id ] ) ? $sidebars[ $sidebar_id ] : array();
+	$sidebar  = $sidebars[ $sidebar_id ] ?? array();
 
 	// Delete.
 	if ( isset( $_POST['delete_widget'] ) && $_POST['delete_widget'] ) {
@@ -3353,12 +3353,12 @@ function wp_ajax_send_attachment_to_editor() {
 	remove_filter( 'media_send_to_editor', 'image_media_send_to_editor' );
 
 	if ( str_starts_with( $post->post_mime_type, 'image' ) ) {
-		$align = isset( $attachment['align'] ) ? $attachment['align'] : 'none';
-		$size  = isset( $attachment['image-size'] ) ? $attachment['image-size'] : 'medium';
-		$alt   = isset( $attachment['image_alt'] ) ? $attachment['image_alt'] : '';
+		$align = $attachment['align'] ?? 'none';
+		$size  = $attachment['image-size'] ?? 'medium';
+		$alt   = $attachment['image_alt'] ?? '';
 
 		// No whitespace-only captions.
-		$caption = isset( $attachment['post_excerpt'] ) ? $attachment['post_excerpt'] : '';
+		$caption = $attachment['post_excerpt'] ?? '';
 		if ( '' === trim( $caption ) ) {
 			$caption = '';
 		}
@@ -3368,7 +3368,7 @@ function wp_ajax_send_attachment_to_editor() {
 	} elseif ( wp_attachment_is( 'video', $post ) || wp_attachment_is( 'audio', $post ) ) {
 		$html = stripslashes_deep( $_POST['html'] );
 	} else {
-		$html = isset( $attachment['post_title'] ) ? $attachment['post_title'] : '';
+		$html = $attachment['post_title'] ?? '';
 		$rel  = $rel ? ' rel="attachment wp-att-' . $id . '"' : ''; // Hard-coded string, $id is already sanitized.
 
 		if ( ! empty( $url ) ) {
@@ -3421,7 +3421,7 @@ function wp_ajax_send_link_to_editor() {
 		$link_text = wp_basename( $src );
 	}
 
-	$post = get_post( isset( $_POST['post_id'] ) ? $_POST['post_id'] : 0 );
+	$post = get_post( $_POST['post_id'] ?? 0 );
 
 	// Ping WordPress for an embed.
 	$check_embed = $wp_embed->run_shortcode( '[embed]' . $src . '[/embed]' );
@@ -3647,7 +3647,7 @@ function wp_ajax_query_themes() {
 		}
 	}
 
-	$old_filter = isset( $args['browse'] ) ? $args['browse'] : 'search';
+	$old_filter = $args['browse'] ?? 'search';
 
 	/** This filter is documented in wp-admin/includes/class-wp-theme-install-list-table.php */
 	$args = apply_filters( 'install_themes_table_api_args_' . $old_filter, $args );

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;

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;

src/wp-admin/includes/class-language-pack-upgrader.php

@@ -265,7 +265,7 @@ public function bulk_upgrade( $language_updates = array(), $args = array() ) {
 			$language_updates_results[] = array(
 				'language' => $language_update->language,
 				'type'     => $language_update->type,
-				'slug'     => isset( $language_update->slug ) ? $language_update->slug : 'default',
+				'slug'     => $language_update->slug ?? 'default',
 				'version'  => $language_update->version,
 			);
 		}

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(

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'] );
 		}

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(

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 ) {

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.' )
 			);
 		}
 

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' ),

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,
 			)
 		);
 	}

src/wp-admin/includes/class-wp-list-table.php

@@ -1451,11 +1451,11 @@ public function print_column_headers( $with_id = true ) {
 			}
 
 			if ( isset( $sortable[ $column_key ] ) ) {
-				$orderby       = isset( $sortable[ $column_key ][0] ) ? $sortable[ $column_key ][0] : '';
-				$desc_first    = isset( $sortable[ $column_key ][1] ) ? $sortable[ $column_key ][1] : false;
-				$abbr          = isset( $sortable[ $column_key ][2] ) ? $sortable[ $column_key ][2] : '';
-				$orderby_text  = isset( $sortable[ $column_key ][3] ) ? $sortable[ $column_key ][3] : '';
-				$initial_order = isset( $sortable[ $column_key ][4] ) ? $sortable[ $column_key ][4] : '';
+				$orderby       = $sortable[ $column_key ][0] ?? '';
+				$desc_first    = $sortable[ $column_key ][1] ?? false;
+				$abbr          = $sortable[ $column_key ][2] ?? '';
+				$orderby_text  = $sortable[ $column_key ][3] ?? '';
+				$initial_order = $sortable[ $column_key ][4] ?? '';
 
 				/*
 				 * We're in the initial view and there's no $_GET['orderby'] then check if the
@@ -1567,11 +1567,11 @@ public function print_table_description() {
 		foreach ( array_keys( $columns ) as $column_key ) {
 
 			if ( isset( $sortable[ $column_key ] ) ) {
-				$orderby       = isset( $sortable[ $column_key ][0] ) ? $sortable[ $column_key ][0] : '';
-				$desc_first    = isset( $sortable[ $column_key ][1] ) ? $sortable[ $column_key ][1] : false;
-				$abbr          = isset( $sortable[ $column_key ][2] ) ? $sortable[ $column_key ][2] : '';
-				$orderby_text  = isset( $sortable[ $column_key ][3] ) ? $sortable[ $column_key ][3] : '';
-				$initial_order = isset( $sortable[ $column_key ][4] ) ? $sortable[ $column_key ][4] : '';
+				$orderby       = $sortable[ $column_key ][0] ?? '';
+				$desc_first    = $sortable[ $column_key ][1] ?? false;
+				$abbr          = $sortable[ $column_key ][2] ?? '';
+				$orderby_text  = $sortable[ $column_key ][3] ?? '';
+				$initial_order = $sortable[ $column_key ][4] ?? '';
 
 				if ( ! is_string( $orderby_text ) || '' === $orderby_text ) {
 					return;

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,
 			)
 		);
 	}

src/wp-admin/includes/class-wp-ms-sites-list-table.php

@@ -44,7 +44,7 @@ public function __construct( $args = array() ) {
 		parent::__construct(
 			array(
 				'plural' => 'sites',
-				'screen' => isset( $args['screen'] ) ? $args['screen'] : null,
+				'screen' => $args['screen'] ?? null,
 			)
 		);
 	}
@@ -135,7 +135,7 @@ public function prepare_items() {
 			}
 		}
 
-		$order_by = isset( $_REQUEST['orderby'] ) ? $_REQUEST['orderby'] : '';
+		$order_by = $_REQUEST['orderby'] ?? '';
 		if ( 'registered' === $order_by ) {
 			// 'registered' is a valid field name.
 		} elseif ( 'lastupdated' === $order_by ) {

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.

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();
 

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 );