Use null coalescing operator instead of isset() ternaries

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

@@ -105,14 +105,14 @@ public function prepare_items() {
 			$comment_type = $_REQUEST['comment_type'];
 		}
 
-		$search = ( isset( $_REQUEST['s'] ) ) ? $_REQUEST['s'] : '';
+		$search = $_REQUEST['s'] ?? '';
 
 		$post_type = ( isset( $_REQUEST['post_type'] ) ) ? sanitize_key( $_REQUEST['post_type'] ) : '';
 
-		$user_id = ( isset( $_REQUEST['user_id'] ) ) ? $_REQUEST['user_id'] : '';
+		$user_id = $_REQUEST['user_id'] ?? '';
 
-		$orderby = ( isset( $_REQUEST['orderby'] ) ) ? $_REQUEST['orderby'] : '';
-		$order   = ( isset( $_REQUEST['order'] ) ) ? $_REQUEST['order'] : '';
+		$orderby = $_REQUEST['orderby'] ?? '';
+		$order   = $_REQUEST['order'] ?? '';
 
 		$comments_per_page = $this->get_per_page( $comment_status );
 

src/wp-admin/network/edit.php

@@ -10,7 +10,7 @@
 /** Load WordPress Administration Bootstrap */
 require_once __DIR__ . '/admin.php';
 
-$action = ( isset( $_GET['action'] ) ) ? $_GET['action'] : '';
+$action = $_GET['action'] ?? '';
 
 if ( empty( $action ) ) {
 	wp_redirect( network_admin_url() );

src/wp-content/themes/twentyfourteen/inc/featured-content.php

@@ -468,7 +468,7 @@ public static function get_setting( $key = 'all' ) {
 		$options = array_intersect_key( $options, $defaults );
 
 		if ( 'all' !== $key ) {
-			return isset( $options[ $key ] ) ? $options[ $key ] : false;
+			return $options[ $key ] ?? false;
 		}
 
 		return $options;

src/wp-content/themes/twentyfourteen/inc/widgets.php

@@ -70,7 +70,7 @@ public function enqueue_scripts() {
 	 * @param array $instance An array of settings for this widget instance.
 	 */
 	public function widget( $args, $instance ) {
-		$format = isset( $instance['format'] ) ? $instance['format'] : '';
+		$format = $instance['format'] ?? '';
 
 		if ( ! $format || ! in_array( $format, $this->formats, true ) ) {
 			$format = 'aside';
@@ -289,7 +289,7 @@ public function update( $new_instance, $old_instance ) {
 	public function form( $instance ) {
 		$title  = ! empty( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
 		$number = ! empty( $instance['number'] ) ? absint( $instance['number'] ) : 2;
-		$format = isset( $instance['format'] ) ? $instance['format'] : '';
+		$format = $instance['format'] ?? '';
 
 		if ( ! $format || ! in_array( $format, $this->formats, true ) ) {
 			$format = 'aside';

src/wp-content/themes/twentytwentyone/inc/template-functions.php

@@ -473,7 +473,7 @@ function twenty_twenty_one_get_attachment_image_attributes( $attr, $attachment,
 	if ( $width && $height ) {
 
 		// Add style.
-		$attr['style'] = isset( $attr['style'] ) ? $attr['style'] : '';
+		$attr['style'] = $attr['style'] ?? '';
 		$attr['style'] = 'width:100%;height:' . round( 100 * $height / $width, 2 ) . '%;max-width:' . $width . 'px;' . $attr['style'];
 	}
 

src/wp-includes/class-wp-xmlrpc-server.php

@@ -4448,7 +4448,7 @@ public function wp_getMediaLibrary( $args ) {
 		do_action( 'xmlrpc_call', 'wp.getMediaLibrary', $args, $this );
 
 		$parent_id = ( isset( $struct['parent_id'] ) ) ? absint( $struct['parent_id'] ) : '';
-		$mime_type = ( isset( $struct['mime_type'] ) ) ? $struct['mime_type'] : '';
+		$mime_type = $struct['mime_type'] ?? '';
 		$offset    = ( isset( $struct['offset'] ) ) ? absint( $struct['offset'] ) : 0;
 		$number    = ( isset( $struct['number'] ) ) ? absint( $struct['number'] ) : -1;
 

src/wp-includes/functions.php

@@ -3351,7 +3351,7 @@ function wp_get_image_mime( $file ) {
 				$imagesize = @getimagesize( $file );
 			}
 
-			$mime = ( isset( $imagesize['mime'] ) ) ? $imagesize['mime'] : false;
+			$mime = $imagesize['mime'] ?? false;
 		} else {
 			$mime = false;
 		}

src/wp-includes/post-formats.php

@@ -134,7 +134,7 @@ function get_post_format_string( $slug ) {
 	if ( ! $slug ) {
 		return $strings['standard'];
 	} else {
-		return ( isset( $strings[ $slug ] ) ) ? $strings[ $slug ] : '';
+		return $strings[ $slug ] ?? '';
 	}
 }