Ticket #37007: 37007.2.diff

src/wp-trackback.php

@@ -57 +57 @@
 $excerpt   = isset($_POST['excerpt'])   ? wp_unslash($_POST['excerpt'])    : '';
 $blog_name = isset($_POST['blog_name']) ? wp_unslash($_POST['blog_name'])  : '';
 
+/**
+* Fires before the trackback is triggered to allow for disabling trackbacks 
+* or a function to act as the handler.
+*
+* @since 4.7.0
+*
+* @param string $tb_url Trackback URL.
+* @param string $charset Character Set.
+* @param string $title Trackback Title.
+* @param string $excerpt Trackback Excerpt.
+* @param string $blog_name Blog Name.
+*
+*/
+do_action( 'pre_trackback_post', $tb_url, $charset, $title, $excerpt, $blog_name );
+
 if ($charset)
         $charset = str_replace( array(',', ' '), '', strtoupper( trim($charset) ) );
 else