I'm in a dead end with a schedualed task in a wordpress plugin for a multisite. Somehow the action I added don't get triggered. The task is getting schedualed and returns a timestamp when I run wp_next_scheduled(), but the action itself doesn't go off and trigger the function.

Information that might give some clues:

  • It's running on a WPMU-site
  • The cronjob is a part of a plugin
  • I'm using OOP approach
  • The things I'm importing is a custom post type.

Code Example:

class Cronjobs
    function Cronjobs()
        add_action('init', array(&$this, 'add_cronjobs'));

    function add_cronjobs()
        add_action('update_properties_daily', array(&$this, 'do_updates'));

        if(!wp_next_scheduled('update_properties_daily') )
           wp_schedule_event( time(), 'daily', 'update_properties_daily');

    function do_updates()
        /* Do updates */

Could really use the help of some wizes on this one, thanks!


Solution: Create a global function and call that from the custom action.

Apparently is there some glitch with creating custom actions while refering to an object. Since custom actions is stored in the DB (as far as I've understood), the objected won't be instansiated and therefor can't use it's methods. Therefor: back to basics and use a global function.

  • Are you 100% sure it's not getting called? Try logging something to file as the first line of your action - it may be that it is being called but causing a fatal error before anything useful happens.
    – DaveRandom
    Commented Sep 26, 2011 at 11:16
  • Has a file_put_contents() in the first line, that works when the method is called outside the action. No success, though. Thx for the answer, btw.
    – user534736
    Commented Sep 26, 2011 at 11:34
  • Where / when do you instantiate your class? Ensure the action is registered and the class instantiated when wpcron gets fired.
    – hakre
    Commented Sep 26, 2011 at 11:35

2 Answers 2


You need to call add_action from outside the class, with a reference to the object. Example:

$cj = new Cronjobs;
add_action('update_properties_daily', array(&$cj, 'do_updates'));

I think you forgot register_activation_hook()

See http://codex.wordpress.org/Function_Reference/wp_schedule_event

  • Is that really required? Since I'm running it on init and conditioned the wp_schedule_event to only run only if the job doesn't exists I'd figured it would be working anyway. Hmm. No can't be it. It does return a timestamp, so the shedualed task exists. It seems like its the action that isn't working.
    – user534736
    Commented Sep 26, 2011 at 11:27
  • I don't think you need to register an activation hook, if you add it, it's registered automatically. Commented Oct 15, 2015 at 7:27

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