diff -r 7b1b88e27a20 -r 48c4eec2b7e6 wp/wp-includes/class-wp-list-util.php
--- a/wp/wp-includes/class-wp-list-util.php	Thu Sep 29 08:06:27 2022 +0200
+++ b/wp/wp-includes/class-wp-list-util.php	Fri Sep 05 18:40:08 2025 +0200
@@ -13,6 +13,7 @@
  *
  * @since 4.7.0
  */
+#[AllowDynamicProperties]
 class WP_List_Util {
 	/**
 	 * The input array.
@@ -116,12 +117,12 @@
 				if ( is_array( $obj ) ) {
 					// Treat object as an array.
 					if ( array_key_exists( $m_key, $obj ) && ( $m_value == $obj[ $m_key ] ) ) {
-						$matched++;
+						++$matched;
 					}
 				} elseif ( is_object( $obj ) ) {
 					// Treat object as an object.
 					if ( isset( $obj->{$m_key} ) && ( $m_value == $obj->{$m_key} ) ) {
-						$matched++;
+						++$matched;
 					}
 				}
 			}
@@ -165,8 +166,14 @@
 			foreach ( $this->output as $key => $value ) {
 				if ( is_object( $value ) ) {
 					$newlist[ $key ] = $value->$field;
+				} elseif ( is_array( $value ) ) {
+					$newlist[ $key ] = $value[ $field ];
 				} else {
-					$newlist[ $key ] = $value[ $field ];
+					_doing_it_wrong(
+						__METHOD__,
+						__( 'Values for the input array must be either objects or arrays.' ),
+						'6.2.0'
+					);
 				}
 			}
 
@@ -186,12 +193,18 @@
 				} else {
 					$newlist[] = $value->$field;
 				}
-			} else {
+			} elseif ( is_array( $value ) ) {
 				if ( isset( $value[ $index_key ] ) ) {
 					$newlist[ $value[ $index_key ] ] = $value[ $field ];
 				} else {
 					$newlist[] = $value[ $field ];
 				}
+			} else {
+				_doing_it_wrong(
+					__METHOD__,
+					__( 'Values for the input array must be either objects or arrays.' ),
+					'6.2.0'
+				);
 			}
 		}
 
@@ -206,9 +219,10 @@
 	 * @since 4.7.0
 	 *
 	 * @param string|array $orderby       Optional. Either the field name to order by or an array
-	 *                                    of multiple orderby fields as $orderby => $order.
-	 * @param string       $order         Optional. Either 'ASC' or 'DESC'. Only used if $orderby
-	 *                                    is a string.
+	 *                                    of multiple orderby fields as `$orderby => $order`.
+	 *                                    Default empty array.
+	 * @param string       $order         Optional. Either 'ASC' or 'DESC'. Only used if `$orderby`
+	 *                                    is a string. Default 'ASC'.
 	 * @param bool         $preserve_keys Optional. Whether to preserve keys. Default false.
 	 * @return array The sorted array.
 	 */