Ticket #14881: 14881.diff

wp-includes/plugin.php

@@ -349 +349 @@
  * @param mixed $arg,... Optional additional arguments which are passed on to the functions hooked to the action.
  * @return null Will return null if $tag does not exist in $wp_filter array
  */
-function do_action($tag, $arg = '') {
+function do_action($tag) {
         global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
 
         if ( ! isset($wp_actions) )
@@ -374 +374 @@
         }
 
         $args = array();
-        if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
-                $args[] =& $arg[0];
-        else
-                $args[] = $arg;
+        if ( func_num_args() > 1 ) {
+                $arg = func_get_arg(1);
+                if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
+                        $args[] =& $arg[0];
+                else
+                        $args[] = $arg;
+        }
         for ( $a = 2; $a < func_num_args(); $a++ )
                 $args[] = func_get_arg($a);