Ticket #45799: 45799.diff

src/wp-includes/rest-api/class-wp-rest-request.php

@@ -380 +380 @@
          * @since 4.4.0
          *
          * @param string $key Parameter name.
+         * @param mixed  $default Optional. Default value to return if the key does not exist.
          * @return mixed|null Value if set, null otherwise.
          */
-        public function get_param( $key ) {
+        public function get_param( $key, $default = null ) {
                 $order = $this->get_parameter_order();
 
                 foreach ( $order as $type ) {
@@ -392 +393 @@
                         }
                 }
 
-                return null;
+                return $default;
         }
 
         /**