Ticket #16895: 16895.4.patch

wp-includes/functions.php

@@ -3089 +3089 @@
  *
  * @param array $list A list of objects or arrays
  * @param int|string $field A field from the object to place instead of the entire object
- * @return array
+ * @return array All field values of the input list
  */
 function wp_list_pluck( $list, $field ) {
+        $fields = array();
         foreach ( $list as $key => $value ) {
                 $value = (array) $value;
-                $list[ $key ] = $value[ $field ];
+                $fields[ $key ] = & $value[ $field ]; # preserve possible references
         }
 
-        return $list;
+        return $fields;
 }
 
 /**