Ticket #18997: #18997.2.patch

wp-includes/cron.php

@@ -164 +164 @@
                 wp_unschedule_event( $timestamp, $hook, $args );
 }
 
+/** 
+* Unschedule all previously scheduled cron job for a hook. 
+*
+* Can be usefull for plugins when deactivating to clean up the cron queue 
+* 
+* The $hook parameter is required, so that the events can be 
+* identified. 
+* 
+* @since 3.4 
+* 
+* @param string $hook Action hook, the execution of which will be unscheduled. 
+*/ 
+function wp_unschedule_hook( $hook ) { 
+        $crons = _get_cron_array(); 
+        foreach( $crons as $timestamp => $args ) { 
+                unset( $crons[$timestamp][$hook] ); 
+                if ( empty( $crons[$timestamp] ) )
+                        unset( $crons[$timestamp] ); 
+        } 
+        _set_cron_array( $crons ); 
+} 
+
 /**
  * Retrieve the next timestamp for a cron event.
  *