<?php

/**

 * WordPress Cron Implementation for hosts, which do not offer CRON or for which

 * the user has not set up a CRON job pointing to this file.

 *

 * The HTTP request to this file will not slow down the visitor who happens to

 * visit when the cron job is needed to run.

 *

 * @package WordPress

 */

ignore_user_abort(true);

if ( !empty($_POST) || defined('DOING_AJAX') || defined('DOING_CRON') )

	die();

/**

 * Tell WordPress we are doing the CRON task.

 *

 * @var bool

 */

define('DOING_CRON', true);

if ( !defined('ABSPATH') ) {

	/** Set up WordPress environment */

	require_once( dirname( __FILE__ ) . '/wp-load.php' );

}

// Uncached doing_cron transient fetch

function _get_cron_lock() {

	global $wpdb;

	$value = 0;

	if ( wp_using_ext_object_cache() ) {

		// Skip local cache and force refetch of doing_cron transient in case

		// another processs updated the cache

		$value = wp_cache_get( 'doing_cron', 'transient', true );

	} else {

		$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );

		if ( is_object( $row ) )

			$value = $row->option_value;

	}

	return $value;

}

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

	die();

$keys = array_keys( $crons );

$gmt_time = microtime( true );

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

	die();

$doing_cron_transient = get_transient( 'doing_cron');

// Use global $doing_wp_cron lock otherwise use the GET lock. If no lock, trying grabbing a new lock.

if ( empty( $doing_wp_cron ) ) {

	if ( empty( $_GET[ 'doing_wp_cron' ] ) ) {

		// Called from external script/job. Try setting a lock.

		if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) )

			return;

		$doing_cron_transient = $doing_wp_cron = sprintf( '%.22F', microtime( true ) );

		set_transient( 'doing_cron', $doing_wp_cron );

	} else {

		$doing_wp_cron = $_GET[ 'doing_wp_cron' ];

	}

}

// Check lock

if ( $doing_cron_transient != $doing_wp_cron )

	return;

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

	if ( $timestamp > $gmt_time )

		break;

	foreach ( $cronhooks as $hook => $keys ) {

		foreach ( $keys as $k => $v ) {

			$schedule = $v['schedule'];

			if ( $schedule != false ) {

				$new_args = array($timestamp, $schedule, $hook, $v['args']);

				call_user_func_array('wp_reschedule_event', $new_args);

			}

			wp_unschedule_event( $timestamp, $hook, $v['args'] );

			/**

			 * Fires scheduled events.

			 *

			 * @since 2.1.0

			 *

			 * @param string $hook Name of the hook that was scheduled to be fired.

			 * @param array $v['args'] The arguments to be passed to the hook.

			 */

 			do_action_ref_array( $hook, $v['args'] );

			// If the hook ran too long and another cron process stole the lock, quit.

			if ( _get_cron_lock() != $doing_wp_cron )

				return;

		}

	}

}

if ( _get_cron_lock() == $doing_wp_cron )

	delete_transient( 'doing_cron' );

die();