wp_get_schedules() │ WP 2.1.0

Retrieve supported event recurrence schedules.

The default supported recurrences are 'hourly', 'twicedaily', 'daily', and 'weekly'. A plugin may add more by hooking into the cron_schedules filter. The filter accepts an array of arrays. The outer array has a key that is the name of the schedule, for example 'monthly'. The value is an array with two keys, one is 'interval' and the other is 'display'.

The 'interval' is a number in seconds of when the cron job should run. So for 'hourly' the time is HOUR_IN_SECONDS (60 60 or 3600). For 'monthly', the value would be MONTH_IN_SECONDS (30 24 60 60 or 2592000).

The 'display' is the description. For the 'monthly' key, the 'display' would be __('Once Monthly').

For your plugin, you will be passed an array. You can easily add your schedule by doing the following.

// Filter parameter variable name is 'array'.
$array['monthly'] = array(
	'interval' => MONTH_IN_SECONDS,
	'display'  => __( 'Once Monthly' )
);
1 time — 0.000001 sec (speed of light) | 50000 times — 0.91 sec (very fast) | PHP 7.0.19, WP 5.0.2
Hooks from the function

Return

Array. The array of cron schedules keyed by the schedule name.

Usage

wp_get_schedules();

Examples

0

#1 An example of what the function returns: 

$rrr = wp_get_schedules();

echo print_r($rrr);

/*
we get:
Array
(
	[hourly] => Array
		(
			[interval] => 3600
			[display] => Every hour
		)

	[twicedaily] => Array
		(
			[interval] => 43200
			[display] => Twice a day
		)

	[daily] => Array
		(
			[interval] => 86400
			[display] => Every day
		)

)
*/
0

#2 Example of adding a new interval for a plugin.

To add a new interval for Cron in WordPress we can use the filter cron_schedules. Let's add an event recurrence interval: once a week:

add_filter( 'cron_schedules', 'cron_add_weekly' );

function cron_add_weekly( $schedules ) {

	// Adds once weekly to the existing schedules.
	$schedules['weekly'] = array(
		'interval' => WEEK_IN_SECONDS, // 604800 sec.
		'display' => __( 'Once Weekly' )
	);

	return $schedules;
}

Changelog

Since 2.1.0 Introduced.
Since 5.4.0 The 'weekly' schedule was added.

wp_get_schedules() code WP 6.5.2

wp-includes/cron.php 
function wp_get_schedules() {
	$schedules = array(
		'hourly'     => array(
			'interval' => HOUR_IN_SECONDS,
			'display'  => __( 'Once Hourly' ),
		),
		'twicedaily' => array(
			'interval' => 12 * HOUR_IN_SECONDS,
			'display'  => __( 'Twice Daily' ),
		),
		'daily'      => array(
			'interval' => DAY_IN_SECONDS,
			'display'  => __( 'Once Daily' ),
		),
		'weekly'     => array(
			'interval' => WEEK_IN_SECONDS,
			'display'  => __( 'Once Weekly' ),
		),
	);

	/**
	 * Filters the non-default cron schedules.
	 *
	 * @since 2.1.0
	 *
	 * @param array $new_schedules {
	 *     An array of non-default cron schedules keyed by the schedule name. Default empty array.
	 *
	 *     @type array ...$0 {
	 *         Cron schedule information.
	 *
	 *         @type int    $interval The schedule interval in seconds.
	 *         @type string $display  The schedule display name.
	 *     }
	 * }
	 */
	return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );
}

cron (schedule)