<?php

/**

 * A pseudo-CRON daemon for scheduling WordPress tasks

 *

 * WP Cron is triggered when the site receives a visit. In the scenario

 * where a site may not receive enough visits to execute scheduled tasks

 * in a timely manner, this file can be called directly or via a server

 * CRON daemon for X number of times.

 *

 * Defining DISABLE_WP_CRON as true and calling this file directly are

 * mutually exclusive and the latter does not rely on the former to work.

 *

 * 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 );

/* Don't make the request block till we finish, if possible. */

if ( function_exists( 'fastcgi_finish_request' ) && version_compare( phpversion(), '7.0.16', '>=' ) ) {

	fastcgi_finish_request();

}

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' );

}

/**

 * Retrieves the cron lock.

 *

 * Returns the uncached `doing_cron` transient.

 *

 * @ignore

 * @since 3.3.0

 *

 * @global wpdb $wpdb WordPress database abstraction object.

 *

 * @return string|false Value of the `doing_cron` transient, 0|false otherwise.

 */

function _get_cron_lock() {

	global $wpdb;

	$value = 0;

	if ( wp_using_ext_object_cache() ) {

		/*

		 * Skip local cache and force re-fetch of doing_cron transient

		 * in case another process 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;

}

$crons = wp_get_ready_cron_jobs();

if ( empty( $crons ) ) {

	die();

}

$gmt_time = microtime( true );

// The cron lock: a unix timestamp from when the cron was spawned.

$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'];

	}

}

/*

 * The cron lock (a unix timestamp set when the cron was spawned),

 * must match $doing_wp_cron (the "key").

 */

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.

			 *

			 * @ignore

			 * @since 2.1.0

			 *

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

			 * @param array  $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();