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   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  /**
  30   * Retrieves the cron lock.
  31   *
  32   * Returns the uncached `doing_cron` transient.
  33   *
  34   * @ignore
  35   * @since 3.3.0
  36   *
  37   * @global wpdb $wpdb WordPress database abstraction object.
  38   *
  39   * @return string|false Value of the `doing_cron` transient, 0|false otherwise.
  40   */
  41  function _get_cron_lock() {
  42      global $wpdb;
  43  
  44      $value = 0;
  45      if ( wp_using_ext_object_cache() ) {
  46          /*
  47           * Skip local cache and force re-fetch of doing_cron transient
  48           * in case another process updated the cache.
  49           */
  50          $value = wp_cache_get( 'doing_cron', 'transient', true );
  51      } else {
  52          $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );
  53          if ( is_object( $row ) )
  54              $value = $row->option_value;
  55      }
  56  
  57      return $value;
  58  }
  59  
  60  if ( false === $crons = _get_cron_array() )
  61      die();
  62  
  63  $keys = array_keys( $crons );
  64  $gmt_time = microtime( true );
  65  
  66  if ( isset($keys[0]) && $keys[0] > $gmt_time )
  67      die();
  68  
  69  
  70  // The cron lock: a unix timestamp from when the cron was spawned.
  71  $doing_cron_transient = get_transient( 'doing_cron' );
  72  
  73  // Use global $doing_wp_cron lock otherwise use the GET lock. If no lock, trying grabbing a new lock.
  74  if ( empty( $doing_wp_cron ) ) {
  75      if ( empty( $_GET[ 'doing_wp_cron' ] ) ) {
  76          // Called from external script/job. Try setting a lock.
  77          if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) )
  78              return;
  79          $doing_cron_transient = $doing_wp_cron = sprintf( '%.22F', microtime( true ) );
  80          set_transient( 'doing_cron', $doing_wp_cron );
  81      } else {
  82          $doing_wp_cron = $_GET[ 'doing_wp_cron' ];
  83      }
  84  }
  85  
  86  /*
  87   * The cron lock (a unix timestamp set when the cron was spawned),
  88   * must match $doing_wp_cron (the "key").
  89   */
  90  if ( $doing_cron_transient != $doing_wp_cron )
  91      return;
  92  
  93  foreach ( $crons as $timestamp => $cronhooks ) {
  94      if ( $timestamp > $gmt_time )
  95          break;
  96  
  97      foreach ( $cronhooks as $hook => $keys ) {
  98  
  99          foreach ( $keys as $k => $v ) {
 100  
 101              $schedule = $v['schedule'];
 102  
 103              if ( $schedule != false ) {
 104                  $new_args = array($timestamp, $schedule, $hook, $v['args']);
 105                  call_user_func_array('wp_reschedule_event', $new_args);
 106              }
 107  
 108              wp_unschedule_event( $timestamp, $hook, $v['args'] );
 109  
 110              /**
 111               * Fires scheduled events.
 112               *
 113               * @ignore
 114               * @since 2.1.0
 115               *
 116               * @param string $hook Name of the hook that was scheduled to be fired.
 117               * @param array  $args The arguments to be passed to the hook.
 118               */
 119               do_action_ref_array( $hook, $v['args'] );
 120  
 121              // If the hook ran too long and another cron process stole the lock, quit.
 122              if ( _get_cron_lock() != $doing_wp_cron )
 123                  return;
 124          }
 125      }
 126  }
 127  
 128  if ( _get_cron_lock() == $doing_wp_cron )
 129      delete_transient( 'doing_cron' );
 130  
 131  die();


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