<?php
/*
Plugin Name: wp cron clone
Plugin URI: http://wordpress.org/support/topic/109641
Description: run cron tasks without running wp-cron.php on the server.
Author: yoshi
Version: 0.1
*/

remove_action('init', 'wp_cron');
if(!defined('DOING_CRON'))
  add_action('init', 'wp_cron_clone');

function wp_cron_clone() {

	// Prevent infinite loops caused by lack of wp-cron.php
	if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false )
		return;

	$crons = _get_cron_array();
	
	if ( !is_array($crons) )
		return;

	$keys = array_keys( $crons );
	if ( isset($keys[0]) && $keys[0] > time() )
		return;

	$schedules = wp_get_schedules();
	foreach ( $crons as $timestamp => $cronhooks ) {
		if ( $timestamp > time() ) break;
		foreach ( $cronhooks as $hook => $args ) {
			if ( isset($schedules[$hook]['callback']) && !call_user_func( $schedules[$hook]['callback'] ) )
				continue;
			wp_cron_clone_run();
			break 2;
		}
	}
}

function wp_cron_clone_run() {

  ignore_user_abort(true);

  if ( get_option('doing_cron') > time() )
  	return;

  update_option('doing_cron', time() + 30);

  $crons = _get_cron_array();

  $keys = array_keys($crons);
  if (!is_array($crons) || $keys[0] > time())
  	return;
  foreach ($crons as $timestamp => $cronhooks) {
  	if ($timestamp > time()) break;
  	foreach ($cronhooks as $hook => $keys) {
  		foreach ($keys as $key => $args) {
  			$schedule = $args['schedule'];
  			if ($schedule != false) {
  				$new_args = array($timestamp, $schedule, $hook, $args['args']);
  				call_user_func_array('wp_reschedule_event', $new_args);
  			}
  			wp_unschedule_event($timestamp, $hook, $args['args']);
   			do_action_ref_array($hook, $args['args']);
  		}
  	}
  }

  update_option('doing_cron', 0);

}
?>