diff --git a/src/wp-admin/includes/class-wp-comments-list-table.php b/src/wp-admin/includes/class-wp-comments-list-table.php
index d51c9655e9950..5f1716199bbe6 100644
--- a/src/wp-admin/includes/class-wp-comments-list-table.php
+++ b/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 );
 
diff --git a/src/wp-admin/network/edit.php b/src/wp-admin/network/edit.php
index f46896bd2b5be..f12251babeeb3 100644
--- a/src/wp-admin/network/edit.php
+++ b/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() );
diff --git a/src/wp-includes/class-wp-xmlrpc-server.php b/src/wp-includes/class-wp-xmlrpc-server.php
index ce278a861c285..995ade9508a9a 100644
--- a/src/wp-includes/class-wp-xmlrpc-server.php
+++ b/src/wp-includes/class-wp-xmlrpc-server.php
@@ -4449,7 +4449,7 @@ 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;
 
diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 82a95c265edd8..9cdeef75788f2 100644
--- a/src/wp-includes/functions.php
+++ b/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;
 		}
diff --git a/src/wp-includes/post-formats.php b/src/wp-includes/post-formats.php
index 2c199e6dc052d..9205ecb6e71e2 100644
--- a/src/wp-includes/post-formats.php
+++ b/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 ] ?? '';
 	}
 }