System Cron job not firing

Question

I am new with WordPress development and using cron job for first time. I am having issue with cron job which is not firing. Here are all steps i have taken to achieve this. I have put this line in my wp-config file

define('DISABLE_WP_CRON', true);

Then i have setup a cron job in my cpanel with this command.

wget -q -O - http://mywebsite.com/wp-cron.php?doing_wp_cron >/dev/null 2>&1

I have select interval for every 30 minutes.

But now cron job not firing my WordPress function. Here is my code that i am using in functions.php of my theme.

wp_schedule_event(time(), 'hourly', 'my_hourly_event'); 
add_action('my_hourly_event', 'do_this_hourly');
function do_this_hourly() {
wp_mail( '[email protected]', 'Automatic email', 'Automatic scheduled email from WordPress to test cron');
}

Can anybody tell me what i am doing wrong with this because i am not receiving emails from this function. I will really appreciate your help.
Thank you!

Answer 1

You need to first create the interval for 30 mins. Use filter:

add_filter('cron_schedules','my_cron_schedules', 999 );
function my_cron_schedules($schedules) {
    $schedules['thirty_min'] = array(
        'interval' => 1800, // Every 30 mins
        'display'  => __( 'Every 30 mins' ),
    );
    return $schedules;
}

Then you need to execute the scheduled job:

wp_schedule_event( time(), 'thirty_min', 'your_event_hook' );

Then add the action and the callback function:

add_action('your_event_hook', 'do_this_hourly');
function do_this_hourly() {
    wp_mail( '[email protected]', 'Automatic email', 'Automatic scheduled email from WordPress to test cron');
}

you need define('DISABLE_WP_CRON', true); in your wp-config.php

Then you can schedule your system cron.