1 <?php

     2 /**

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

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

     5  *

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

     7  * visit when the cron job is needed to run.

     8  *

     9  * @package WordPress

    10  */

    11 

    12 ignore_user_abort(true);

    13 

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

    15 	die();

    16 

    17 /**

    18  * Tell WordPress we are doing the CRON task.

    19  *

    20  * @var bool

    21  */

    22 define('DOING_CRON', true);

    23 

    24 if ( !defined('ABSPATH') ) {

    25 	/** Set up WordPress environment */

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

    27 }

    28 

    29 // Uncached doing_cron transient fetch

    30 function _get_cron_lock() {

    31 	global $wpdb;

    32 

    33 	$value = 0;

    34 	if ( wp_using_ext_object_cache() ) {

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

    36 		// another processs updated the cache

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

    38 	} else {

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

    40 		if ( is_object( $row ) )

    41 			$value = $row->option_value;

    42 	}

    43 

    44 	return $value;

    45 }

    46 

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

    48 	die();

    49 

    50 $keys = array_keys( $crons );

    51 $gmt_time = microtime( true );

    52 

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

    54 	die();

    55 

    56 $doing_cron_transient = get_transient( 'doing_cron');

    57 

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

    59 if ( empty( $doing_wp_cron ) ) {

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

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

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

    63 			return;

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

    65 		set_transient( 'doing_cron', $doing_wp_cron );

    66 	} else {

    67 		$doing_wp_cron = $_GET[ 'doing_wp_cron' ];

    68 	}

    69 }

    70 

    71 // Check lock

    72 if ( $doing_cron_transient != $doing_wp_cron )

    73 	return;

    74 

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

    76 	if ( $timestamp > $gmt_time )

    77 		break;

    78 

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

    80 

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

    82 

    83 			$schedule = $v['schedule'];

    84 

    85 			if ( $schedule != false ) {

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

    87 				call_user_func_array('wp_reschedule_event', $new_args);

    88 			}

    89 

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

    91 

    92 			/**

    93 			 * Fires scheduled events.

    94 			 *

    95 			 * @since 2.1.0

    96 			 *

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

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

    99 			 */

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

   101 

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

   103 			if ( _get_cron_lock() != $doing_wp_cron )

   104 				return;

   105 		}

   106 	}

   107 }

   108 

   109 if ( _get_cron_lock() == $doing_wp_cron )

   110 	delete_transient( 'doing_cron' );

   111 

   112 die();