Ticket #37007: 37007.diff

src/wp-trackback.php

@@ -41 +41 @@
         }
 }
 
+/**
+* Fires before the trackback is triggered to allow for disabling trackbacks 
+* or a function to act as the handler.
+*
+* @since 4.6.0
+*
+*/
+do_action( 'trackback_handler' );
+
+
 // Trackback is done by a POST.
 $request_array = 'HTTP_POST_VARS';