<?php

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/**

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* A pseudo-cron daemon for scheduling WordPress tasks.

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*

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

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

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

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* cron daemon for X number of times.

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*

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* Defining DISABLE_WP_CRON as true and calling this file directly are

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

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*

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

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* visit when a scheduled cron event runs.

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*

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* @package WordPress

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*/

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ignore_user_abort( true );

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if ( ! headers_sent() ) {

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header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );

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header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );

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}

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// Don't run cron until the request finishes, if possible.

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if ( function_exists( 'fastcgi_finish_request' ) ) {

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fastcgi_finish_request();

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} elseif ( function_exists( 'litespeed_finish_request' ) ) {

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litespeed_finish_request();

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}

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

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die();

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}

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/**

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* Tell WordPress the cron task is running.

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*

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* @var bool

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*/

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define( 'DOING_CRON', true );

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if ( ! defined( 'ABSPATH' ) ) {

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/** Set up WordPress environment */

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require_once __DIR__ . '/wp-load.php';

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}

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// Attempt to raise the PHP memory limit for cron event processing.

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wp_raise_memory_limit( 'cron' );

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/**

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* Retrieves the cron lock.

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*

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* Returns the uncached `doing_cron` transient.

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*

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* @ignore

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* @since 3.3.0

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*

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* @global wpdb $wpdb WordPress database abstraction object.

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*

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

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*/

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function _get_cron_lock() {

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global $wpdb;

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$value = 0;

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if ( wp_using_ext_object_cache() ) {

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/*

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

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* in case another process updated the cache.

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*/

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

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} else {

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

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if ( is_object( $row ) ) {

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$value = $row->option_value;

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}

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}

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return $value;

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}

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$crons = wp_get_ready_cron_jobs();

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if ( empty( $crons ) ) {

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die();

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}

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$gmt_time = microtime( true );

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

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$doing_cron_transient = get_transient( 'doing_cron' );

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// Use global $doing_wp_cron lock, otherwise use the GET lock. If no lock, try to grab a new lock.

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if ( empty( $doing_wp_cron ) ) {

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

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

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

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return;

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}

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

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$doing_cron_transient = $doing_wp_cron;

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set_transient( 'doing_cron', $doing_wp_cron );

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} else {

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$doing_wp_cron = $_GET['doing_wp_cron'];

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}

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}

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/*

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

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

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*/

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if ( $doing_cron_transient !== $doing_wp_cron ) {

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return;

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}

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

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if ( $timestamp > $gmt_time ) {

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break;

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}

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

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

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$schedule = $v['schedule'];

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if ( $schedule ) {

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$result = wp_reschedule_event( $timestamp, $schedule, $hook, $v['args'], true );

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if ( is_wp_error( $result ) ) {

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error_log(

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sprintf(

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/* translators: 1: Hook name, 2: Error code, 3: Error message, 4: Event data. */

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__( 'Cron reschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ),

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$hook,

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$result->get_error_code(),

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$result->get_error_message(),

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wp_json_encode( $v )

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)

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);

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/**

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* Fires if an error happens when rescheduling a cron event.

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*

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* @since 6.1.0

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*

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* @param WP_Error $result The WP_Error object.

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* @param string $hook Action hook to execute when the event is run.

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* @param array $v Event data.

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*/

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do_action( 'cron_reschedule_event_error', $result, $hook, $v );

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}

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}

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$result = wp_unschedule_event( $timestamp, $hook, $v['args'], true );

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if ( is_wp_error( $result ) ) {

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error_log(

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sprintf(

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/* translators: 1: Hook name, 2: Error code, 3: Error message, 4: Event data. */

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__( 'Cron unschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ),

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$hook,

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$result->get_error_code(),

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$result->get_error_message(),

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wp_json_encode( $v )

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)

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);

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/**

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* Fires if an error happens when unscheduling a cron event.

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*

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* @since 6.1.0

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*

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* @param WP_Error $result The WP_Error object.

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* @param string $hook Action hook to execute when the event is run.

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* @param array $v Event data.

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*/

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do_action( 'cron_unschedule_event_error', $result, $hook, $v );

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}

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/**

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* Fires scheduled events.

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*

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* @ignore

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* @since 2.1.0

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*

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

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* @param array $args The arguments to be passed to the hook.

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*/

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

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

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if ( _get_cron_lock() !== $doing_wp_cron ) {

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return;

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}

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}

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}

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}

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if ( _get_cron_lock() === $doing_wp_cron ) {

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delete_transient( 'doing_cron' );

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}

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die();

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