<?php

/**

 * WordPress CRON API

 *

 * @package WordPress

 */

/**

 * Schedules a hook to run only once.

 *

 * Schedules a hook which will be executed once by the WordPress actions core at

 * a time which you specify. The action will fire off when someone visits your

 * WordPress site, if the schedule time has passed.

 *

 * @since 2.1.0

 *

 * @param int $timestamp Timestamp for when to run the event.

 * @param string $hook Action hook to execute when cron is run.

 * @param array $args Optional. Arguments to pass to the hook's callback function.

 */

function wp_schedule_single_event( $timestamp, $hook, $args = array()) {

	$next = wp_next_scheduled($hook, $args);

		return;

	$crons = _get_cron_array();

	$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => false, 'args' => $args );

	// A plugin disallowed this event

	if ( ! $event )

		return false;

	$key = md5(serialize($event->args));

	$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args );

	uksort( $crons, "strnatcasecmp" );

	_set_cron_array( $crons );

}

/**

 * Schedule a periodic event.

 *

 * Schedules a hook which will be executed by the WordPress actions core on a

 * specific interval, specified by you. The action will trigger when someone

 * visits your WordPress site, if the scheduled time has passed.

 *

 * Valid values for the recurrence are hourly, daily and twicedaily. These can

 * be extended using the cron_schedules filter in wp_get_schedules().

 *

 * Use wp_next_scheduled() to prevent duplicates

 *

 * @since 2.1.0

 *

 * @param int $timestamp Timestamp for when to run the event.

 * @param string $recurrence How often the event should recur.

 * @param string $hook Action hook to execute when cron is run.

 * @param array $args Optional. Arguments to pass to the hook's callback function.

 */

function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array()) {

	$crons = _get_cron_array();

	$schedules = wp_get_schedules();

	if ( !isset( $schedules[$recurrence] ) )

		return false;

	$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => $recurrence, 'args' => $args, 'interval' => $schedules[$recurrence]['interval'] );

	// A plugin disallowed this event

	if ( ! $event )

		return false;

	$key = md5(serialize($event->args));

	$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args, 'interval' => $event->interval );

	uksort( $crons, "strnatcasecmp" );

	_set_cron_array( $crons );

}

/**

 * Reschedule a recurring event.

 *

 * @since 2.1.0

 *

 * @param int $timestamp Timestamp for when to run the event.

 * @param string $recurrence How often the event should recur.

 * @param string $hook Action hook to execute when cron is run.

 * @param array $args Optional. Arguments to pass to the hook's callback function.

 */

	$crons = _get_cron_array();

	$schedules = wp_get_schedules();

	$interval = 0;

	// First we try to get it from the schedule

	// Now we try to get it from the saved interval in case the schedule disappears

	// Now we assume something is wrong and fail to schedule

		return false;

	$now = time();

		$timestamp = $now + $interval;

	wp_schedule_event( $timestamp, $recurrence, $hook, $args );

}

/**

 * Unschedule a previously scheduled cron job.

 *

 * The $timestamp and $hook parameters are required, so that the event can be

 * identified.

 *

 * @since 2.1.0

 *

 * @param int $timestamp Timestamp for when to run the event.

 * @param string $hook Action hook, the execution of which will be unscheduled.

 * @param array $args Arguments to pass to the hook's callback function.

 * Although not passed to a callback function, these arguments are used

 * to uniquely identify the scheduled event, so they should be the same

 * as those used when originally scheduling the event.

 */

function wp_unschedule_event( $timestamp, $hook, $args = array() ) {

	$crons = _get_cron_array();

	$key = md5(serialize($args));

	unset( $crons[$timestamp][$hook][$key] );

	if ( empty($crons[$timestamp][$hook]) )

		unset( $crons[$timestamp][$hook] );

	if ( empty($crons[$timestamp]) )

		unset( $crons[$timestamp] );

	_set_cron_array( $crons );

}

/**

 * Unschedule all cron jobs attached to a specific hook.

 *

 * @since 2.1.0

 *

 * @param string $hook Action hook, the execution of which will be unscheduled.

 * @param array $args Optional. Arguments that were to be pass to the hook's callback function.

 */

function wp_clear_scheduled_hook( $hook, $args = array() ) {

	// Backward compatibility

	// Previously this function took the arguments as discrete vars rather than an array like the rest of the API

	if ( !is_array($args) ) {

		_deprecated_argument( __FUNCTION__, '3.0', __('This argument has changed to an array to match the behavior of the other cron functions.') );

		$args = array_slice( func_get_args(), 1 );

	}

}

/**

 * Retrieve the next timestamp for a cron event.

 *

 * @since 2.1.0

 *

 * @param string $hook Action hook to execute when cron is run.

 * @param array $args Optional. Arguments to pass to the hook's callback function.

 * @return bool|int The UNIX timestamp of the next time the scheduled event will occur.

 */

function wp_next_scheduled( $hook, $args = array() ) {

	$crons = _get_cron_array();

	$key = md5(serialize($args));

	if ( empty($crons) )

		return false;

	foreach ( $crons as $timestamp => $cron ) {

		if ( isset( $cron[$hook][$key] ) )

			return $timestamp;

	}

	return false;

}

/**

 * Send request to run cron through HTTP request that doesn't halt page loading.

 *

 * @since 2.1.0

 *

 * @return null Cron could not be spawned, because it is not needed to run.

 */

function spawn_cron( $gmt_time = 0 ) {

	if ( ! $gmt_time )

		$gmt_time = microtime( true );

	if ( defined('DOING_CRON') || isset($_GET['doing_wp_cron']) )

		return;

	/*

	* multiple processes on multiple web servers can run this code concurrently

	* try to make this as atomic as possible by setting doing_cron switch

	*/

	$lock = get_transient('doing_cron');

	if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS )

		$lock = 0;

	// don't run if another process is currently running it or more than once every 60 sec.

	if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time )

		return;

	//sanity check

	$crons = _get_cron_array();

	if ( !is_array($crons) )

		return;

	$keys = array_keys( $crons );

	if ( isset($keys[0]) && $keys[0] > $gmt_time )

		return;

			return;

		$doing_wp_cron = sprintf( '%.22F', $gmt_time );

		set_transient( 'doing_cron', $doing_wp_cron );

		ob_start();

		wp_redirect( add_query_arg( 'doing_wp_cron', $doing_wp_cron, wp_unslash( $_SERVER['REQUEST_URI'] ) ) );

		echo ' ';

		// flush any buffers and send the headers

		while ( @ob_end_flush() );

		flush();

		WP_DEBUG ? include_once( ABSPATH . 'wp-cron.php' ) : @include_once( ABSPATH . 'wp-cron.php' );

		return;

	}

	$doing_wp_cron = sprintf( '%.22F', $gmt_time );

	set_transient( 'doing_cron', $doing_wp_cron );

	$cron_request = apply_filters( 'cron_request', array(

	) );

	wp_remote_post( $cron_request['url'], $cron_request['args'] );

}

/**

 * Run scheduled callbacks or spawn cron for all scheduled events.

 *

 * @since 2.1.0

 *

 * @return null When doesn't need to run Cron.

 */

function wp_cron() {

	// Prevent infinite loops caused by lack of wp-cron.php

	if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) )

		return;

	if ( false === $crons = _get_cron_array() )

		return;

	$gmt_time = microtime( true );

	$keys = array_keys( $crons );

	if ( isset($keys[0]) && $keys[0] > $gmt_time )

		return;

	$schedules = wp_get_schedules();

	foreach ( $crons as $timestamp => $cronhooks ) {

		if ( $timestamp > $gmt_time ) break;

		foreach ( (array) $cronhooks as $hook => $args ) {

			if ( isset($schedules[$hook]['callback']) && !call_user_func( $schedules[$hook]['callback'] ) )

				continue;

			spawn_cron( $gmt_time );

			break 2;

		}

	}

}

/**

 * Retrieve supported and filtered Cron recurrences.

 *

 * The supported recurrences are 'hourly' and 'daily'. 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 or for

 * example 'weekly'. 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 3600 or 60*60. For weekly, the value would be

 * 60*60*24*7 or 604800. The value of 'interval' would then be 604800.

 *

 * The 'display' is the description. For the 'weekly' key, the 'display' would

 *

 * For your plugin, you will be passed an array. you can easily add your

 * schedule by doing the following.

 *

 * @since 2.1.0

 *

 * @return array

 */

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' ) ),

	);

	return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );

}

/**

 * Retrieve Cron schedule for hook with arguments.

 *

 * @since 2.1.0

 *

 * @param string $hook Action hook to execute when cron is run.

 * @param array $args Optional. Arguments to pass to the hook's callback function.

 * @return string|bool False, if no schedule. Schedule on success.

 */

function wp_get_schedule($hook, $args = array()) {

	$crons = _get_cron_array();

	$key = md5(serialize($args));

	if ( empty($crons) )

		return false;

	foreach ( $crons as $timestamp => $cron ) {

		if ( isset( $cron[$hook][$key] ) )

			return $cron[$hook][$key]['schedule'];

	}

	return false;

}

//

// Private functions

//

/**

 * Retrieve cron info array option.

 *

 * @since 2.1.0

 * @access private

 *

 * @return array CRON info array.

 */

function _get_cron_array()  {

	$cron = get_option('cron');

	if ( ! is_array($cron) )

		return false;

	if ( !isset($cron['version']) )

		$cron = _upgrade_cron_array($cron);

	unset($cron['version']);