id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc
17888,Problems with build in Cronjob Schedule - is this a bug?,1manfactory,,"I have programmed a pluging (Emu2 - Email Users 2) to send out mails to users/groups. It's still beta but the main functions work.

Now I added a feature for a digest of the newest posts to be sent out once a day controlled by the build in scheduler.

I do the following:


{{{
# plan the scheduler
 add_action('EMU2_task_hook', 'EMU2_send_scheduled');
}}}


where EMU2_send_scheduled is the function sending all the mails. This is working.


{{{
wp_clear_scheduled_hook('EMU2_task_hook');
 wp_schedule_event( strtotime( $schedule_time ) - get_option('gmt_offset') * 3600 , 'daily', 'EMU2_task_hook' );
}}}


Where $schedule_time is set by the user, e.g. ""23:15"" for mails to be sent at 11:15 pm.

This works, I checked it with wp-crontrol.

But now come the problems.

Some of the users which downloaded my plugin reported strange behaviors with the scheduled mails send out every hour instead of only once a day. Or with mails send three times in a row.

I first thought they did something wrong. But after a few days of stable work it happened to me as well (Online, less than 10 users, Linux)

I am using/testing this on 5 installations, online and offline, on different hosts and systems (Windows/xampp and Linux). Some work today, but they fail the next day with sending two or even three mails at once, i.e. starting the job two/three times.

I have no clue what is going on.

Is this a bug? Is this caused by interferences with other schedules or plugins?",defect (bug),closed,normal,,Cron,3.1.3,normal,worksforme,,