Ticket #50318: 50318.diff

src/wp-includes/rest-api.php

@@ -178 +178 @@
  * @since 4.4.0
  */
 function rest_api_default_filters() {
-        // Deprecated reporting.
-        add_action( 'deprecated_function_run', 'rest_handle_deprecated_function', 10, 3 );
-        add_filter( 'deprecated_function_trigger_error', '__return_false' );
-        add_action( 'deprecated_argument_run', 'rest_handle_deprecated_argument', 10, 3 );
-        add_filter( 'deprecated_argument_trigger_error', '__return_false' );
+        if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
+                // Deprecated reporting.
+                add_action( 'deprecated_function_run', 'rest_handle_deprecated_function', 10, 3 );
+                add_filter( 'deprecated_function_trigger_error', '__return_false' );
+                add_action( 'deprecated_argument_run', 'rest_handle_deprecated_argument', 10, 3 );
+                add_filter( 'deprecated_argument_trigger_error', '__return_false' );
+        }
 
         // Default serving.
         add_filter( 'rest_pre_serve_request', 'rest_send_cors_headers' );