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I'm running WordPress 3.6, multisite. I have a plugin activated with this content (it's been simplified):

function prefix_delete_user() {
    $some_option = get_site_option( 'some_option' ); // at this point it works
    wpmu_delete_user( 2 ); // at this point it doesn't
    return;
}
add_action( 'delete_user_daily', 'prefix_delete_user' );

function setup_schedule() {
    if ( ! wp_next_scheduled( 'delete_user_daily' ) ) {
        wp_schedule_event( time(), 'daily', 'delete_user_daily');
    }
}
add_action( 'wp', 'setup_schedule' );

Every day, a new blog with an ID of 2 is registered and every day I would like to remove it but I'm getting the following error:

PHP Fatal error: Call to undefined function wpmu_delete_user() in /home/example/ftp/example.com/wp-content/plugins/expiration/expiration.php on line 96

I'm wondering why this might be happening?

When I'm calling do_action( 'delete_user_daily' ); manually, it works...

0

Looks like ms.php file is not loaded for cron job. Try to add following line at the beginning of your plugin:

require_once ABSPATH . 'wp-admin/includes/ms.php';
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