diff -r 34716fd837a4 -r be944660c56a wp/wp-admin/includes/class-wp-site-icon.php
--- a/wp/wp-admin/includes/class-wp-site-icon.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-admin/includes/class-wp-site-icon.php	Wed Sep 21 18:19:35 2022 +0200
@@ -87,7 +87,7 @@
 		$parent_url = wp_get_attachment_url( $parent->ID );
 		$url        = str_replace( wp_basename( $parent_url ), wp_basename( $cropped ), $parent_url );
 
-		$size       = @getimagesize( $cropped );
+		$size       = wp_getimagesize( $cropped );
 		$image_type = ( $size ) ? $size['mime'] : 'image/jpeg';
 
 		$object = array(
@@ -216,7 +216,7 @@
 	 *                                    array of values.
 	 * @param int               $post_id  Post ID.
 	 * @param string            $meta_key Meta key.
-	 * @param string|array      $single   Meta value, or an array of values.
+	 * @param bool              $single   Whether to return only the first value of the specified `$meta_key`.
 	 * @return array|null|string The attachment metadata value, array of values, or null.
 	 */
 	public function get_post_metadata( $value, $post_id, $meta_key, $single ) {