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/ -> wp-cron.php (source)

   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 ('./wp-load.php');
  27  }
  28  
  29  // Uncached doing_cron transient fetch
  30  function _get_cron_lock() {
  31      global $_wp_using_ext_object_cache, $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               do_action_ref_array( $hook, $v['args'] );
  93  
  94              // If the hook ran too long and another cron process stole the lock, quit.
  95              if ( _get_cron_lock() != $doing_wp_cron )
  96                  return;
  97          }
  98      }
  99  }
 100  
 101  if ( _get_cron_lock() == $doing_wp_cron )
 102      delete_transient( 'doing_cron' );
 103  
 104  die();


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