415 lines
12 KiB
PHP
415 lines
12 KiB
PHP
<?php
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/**
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* WordPress CRON API
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*
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* @package WordPress
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*/
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/**
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* Schedules a hook to run only once.
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*
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* Schedules a hook which will be executed once by the WordPress actions core at
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* a time which you specify. The action will fire off when someone visits your
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* WordPress site, if the schedule time has passed.
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*
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* @since 2.1.0
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* @link http://codex.wordpress.org/Function_Reference/wp_schedule_single_event
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*
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* @param int $timestamp Timestamp for when to run the event.
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* @param string $hook Action hook to execute when cron is run.
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* @param array $args Optional. Arguments to pass to the hook's callback function.
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*/
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function wp_schedule_single_event( $timestamp, $hook, $args = array()) {
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// don't schedule a duplicate if there's already an identical event due in the next 10 minutes
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$next = wp_next_scheduled($hook, $args);
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if ( $next && $next <= $timestamp + 10 * MINUTE_IN_SECONDS )
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return;
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$crons = _get_cron_array();
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$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => false, 'args' => $args );
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$event = apply_filters('schedule_event', $event);
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// A plugin disallowed this event
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if ( ! $event )
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return false;
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$key = md5(serialize($event->args));
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$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args );
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uksort( $crons, "strnatcasecmp" );
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_set_cron_array( $crons );
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}
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/**
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* Schedule a periodic event.
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*
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* Schedules a hook which will be executed by the WordPress actions core on a
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* specific interval, specified by you. The action will trigger when someone
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* visits your WordPress site, if the scheduled time has passed.
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*
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* Valid values for the recurrence are hourly, daily and twicedaily. These can
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* be extended using the cron_schedules filter in wp_get_schedules().
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*
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* Use wp_next_scheduled() to prevent duplicates
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*
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* @since 2.1.0
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*
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* @param int $timestamp Timestamp for when to run the event.
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* @param string $recurrence How often the event should recur.
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* @param string $hook Action hook to execute when cron is run.
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* @param array $args Optional. Arguments to pass to the hook's callback function.
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* @return bool|null False on failure, null when complete with scheduling event.
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*/
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function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array()) {
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$crons = _get_cron_array();
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$schedules = wp_get_schedules();
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if ( !isset( $schedules[$recurrence] ) )
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return false;
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$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => $recurrence, 'args' => $args, 'interval' => $schedules[$recurrence]['interval'] );
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$event = apply_filters('schedule_event', $event);
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// A plugin disallowed this event
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if ( ! $event )
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return false;
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$key = md5(serialize($event->args));
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$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args, 'interval' => $event->interval );
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uksort( $crons, "strnatcasecmp" );
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_set_cron_array( $crons );
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}
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/**
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* Reschedule a recurring event.
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*
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* @since 2.1.0
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*
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* @param int $timestamp Timestamp for when to run the event.
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* @param string $recurrence How often the event should recur.
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* @param string $hook Action hook to execute when cron is run.
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* @param array $args Optional. Arguments to pass to the hook's callback function.
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* @return bool|null False on failure. Null when event is rescheduled.
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*/
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function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array()) {
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$crons = _get_cron_array();
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$schedules = wp_get_schedules();
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$key = md5(serialize($args));
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$interval = 0;
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// First we try to get it from the schedule
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if ( 0 == $interval )
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$interval = $schedules[$recurrence]['interval'];
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// Now we try to get it from the saved interval in case the schedule disappears
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if ( 0 == $interval )
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$interval = $crons[$timestamp][$hook][$key]['interval'];
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// Now we assume something is wrong and fail to schedule
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if ( 0 == $interval )
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return false;
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$now = time();
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if ( $timestamp >= $now )
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$timestamp = $now + $interval;
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else
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$timestamp = $now + ($interval - (($now - $timestamp) % $interval));
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wp_schedule_event( $timestamp, $recurrence, $hook, $args );
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}
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/**
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* Unschedule a previously scheduled cron job.
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*
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* The $timestamp and $hook parameters are required, so that the event can be
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* identified.
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*
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* @since 2.1.0
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*
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* @param int $timestamp Timestamp for when to run the event.
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* @param string $hook Action hook, the execution of which will be unscheduled.
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* @param array $args Arguments to pass to the hook's callback function.
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* Although not passed to a callback function, these arguments are used
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* to uniquely identify the scheduled event, so they should be the same
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* as those used when originally scheduling the event.
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*/
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function wp_unschedule_event( $timestamp, $hook, $args = array() ) {
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$crons = _get_cron_array();
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$key = md5(serialize($args));
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unset( $crons[$timestamp][$hook][$key] );
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if ( empty($crons[$timestamp][$hook]) )
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unset( $crons[$timestamp][$hook] );
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if ( empty($crons[$timestamp]) )
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unset( $crons[$timestamp] );
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_set_cron_array( $crons );
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}
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/**
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* Unschedule all cron jobs attached to a specific hook.
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*
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* @since 2.1.0
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*
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* @param string $hook Action hook, the execution of which will be unscheduled.
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* @param array $args Optional. Arguments that were to be pass to the hook's callback function.
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*/
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function wp_clear_scheduled_hook( $hook, $args = array() ) {
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// Backward compatibility
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// Previously this function took the arguments as discrete vars rather than an array like the rest of the API
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if ( !is_array($args) ) {
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_deprecated_argument( __FUNCTION__, '3.0', __('This argument has changed to an array to match the behavior of the other cron functions.') );
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$args = array_slice( func_get_args(), 1 );
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}
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while ( $timestamp = wp_next_scheduled( $hook, $args ) )
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wp_unschedule_event( $timestamp, $hook, $args );
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}
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/**
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* Retrieve the next timestamp for a cron event.
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*
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* @since 2.1.0
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*
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* @param string $hook Action hook to execute when cron is run.
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* @param array $args Optional. Arguments to pass to the hook's callback function.
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* @return bool|int The UNIX timestamp of the next time the scheduled event will occur.
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*/
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function wp_next_scheduled( $hook, $args = array() ) {
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$crons = _get_cron_array();
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$key = md5(serialize($args));
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if ( empty($crons) )
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return false;
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foreach ( $crons as $timestamp => $cron ) {
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if ( isset( $cron[$hook][$key] ) )
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return $timestamp;
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}
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return false;
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}
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/**
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* Send request to run cron through HTTP request that doesn't halt page loading.
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*
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* @since 2.1.0
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*
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* @return null Cron could not be spawned, because it is not needed to run.
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*/
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function spawn_cron( $gmt_time = 0 ) {
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if ( ! $gmt_time )
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$gmt_time = microtime( true );
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if ( defined('DOING_CRON') || isset($_GET['doing_wp_cron']) )
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return;
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/*
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* multiple processes on multiple web servers can run this code concurrently
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* try to make this as atomic as possible by setting doing_cron switch
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*/
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$lock = get_transient('doing_cron');
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if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS )
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$lock = 0;
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// don't run if another process is currently running it or more than once every 60 sec.
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if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time )
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return;
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//sanity check
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$crons = _get_cron_array();
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if ( !is_array($crons) )
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return;
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$keys = array_keys( $crons );
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if ( isset($keys[0]) && $keys[0] > $gmt_time )
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return;
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if ( defined('ALTERNATE_WP_CRON') && ALTERNATE_WP_CRON ) {
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if ( !empty($_POST) || defined('DOING_AJAX') )
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return;
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$doing_wp_cron = sprintf( '%.22F', $gmt_time );
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set_transient( 'doing_cron', $doing_wp_cron );
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ob_start();
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wp_redirect( add_query_arg('doing_wp_cron', $doing_wp_cron, stripslashes($_SERVER['REQUEST_URI'])) );
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echo ' ';
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// flush any buffers and send the headers
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while ( @ob_end_flush() );
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flush();
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WP_DEBUG ? include_once( ABSPATH . 'wp-cron.php' ) : @include_once( ABSPATH . 'wp-cron.php' );
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return;
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}
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$doing_wp_cron = sprintf( '%.22F', $gmt_time );
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set_transient( 'doing_cron', $doing_wp_cron );
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$cron_request = apply_filters( 'cron_request', array(
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'url' => site_url( 'wp-cron.php?doing_wp_cron=' . $doing_wp_cron ),
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'key' => $doing_wp_cron,
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'args' => array( 'timeout' => 0.01, 'blocking' => false, 'sslverify' => apply_filters( 'https_local_ssl_verify', true ) )
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) );
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wp_remote_post( $cron_request['url'], $cron_request['args'] );
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}
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/**
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* Run scheduled callbacks or spawn cron for all scheduled events.
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*
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* @since 2.1.0
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*
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* @return null When doesn't need to run Cron.
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*/
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function wp_cron() {
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// Prevent infinite loops caused by lack of wp-cron.php
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if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) )
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return;
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if ( false === $crons = _get_cron_array() )
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return;
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$gmt_time = microtime( true );
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$keys = array_keys( $crons );
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if ( isset($keys[0]) && $keys[0] > $gmt_time )
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return;
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$schedules = wp_get_schedules();
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foreach ( $crons as $timestamp => $cronhooks ) {
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if ( $timestamp > $gmt_time ) break;
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foreach ( (array) $cronhooks as $hook => $args ) {
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if ( isset($schedules[$hook]['callback']) && !call_user_func( $schedules[$hook]['callback'] ) )
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continue;
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spawn_cron( $gmt_time );
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break 2;
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}
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}
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}
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/**
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* Retrieve supported and filtered Cron recurrences.
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*
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* The supported recurrences are 'hourly' and 'daily'. A plugin may add more by
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* hooking into the 'cron_schedules' filter. The filter accepts an array of
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* arrays. The outer array has a key that is the name of the schedule or for
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* example 'weekly'. The value is an array with two keys, one is 'interval' and
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* the other is 'display'.
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*
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* The 'interval' is a number in seconds of when the cron job should run. So for
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* 'hourly', the time is 3600 or 60*60. For weekly, the value would be
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* 60*60*24*7 or 604800. The value of 'interval' would then be 604800.
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*
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* The 'display' is the description. For the 'weekly' key, the 'display' would
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* be <code>__('Once Weekly')</code>.
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*
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* For your plugin, you will be passed an array. you can easily add your
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* schedule by doing the following.
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* <code>
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* // filter parameter variable name is 'array'
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* $array['weekly'] = array(
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* 'interval' => 604800,
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* 'display' => __('Once Weekly')
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* );
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* </code>
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*
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* @since 2.1.0
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*
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* @return array
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*/
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function wp_get_schedules() {
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$schedules = array(
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'hourly' => array( 'interval' => HOUR_IN_SECONDS, 'display' => __( 'Once Hourly' ) ),
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'twicedaily' => array( 'interval' => 12 * HOUR_IN_SECONDS, 'display' => __( 'Twice Daily' ) ),
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'daily' => array( 'interval' => DAY_IN_SECONDS, 'display' => __( 'Once Daily' ) ),
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);
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return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );
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}
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/**
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* Retrieve Cron schedule for hook with arguments.
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*
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* @since 2.1.0
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*
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* @param string $hook Action hook to execute when cron is run.
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* @param array $args Optional. Arguments to pass to the hook's callback function.
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* @return string|bool False, if no schedule. Schedule on success.
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*/
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function wp_get_schedule($hook, $args = array()) {
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$crons = _get_cron_array();
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$key = md5(serialize($args));
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if ( empty($crons) )
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return false;
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foreach ( $crons as $timestamp => $cron ) {
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if ( isset( $cron[$hook][$key] ) )
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return $cron[$hook][$key]['schedule'];
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}
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return false;
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}
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//
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// Private functions
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//
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/**
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* Retrieve cron info array option.
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*
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* @since 2.1.0
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* @access private
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*
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* @return array CRON info array.
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*/
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function _get_cron_array() {
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$cron = get_option('cron');
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if ( ! is_array($cron) )
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return false;
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if ( !isset($cron['version']) )
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$cron = _upgrade_cron_array($cron);
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unset($cron['version']);
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return $cron;
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}
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/**
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* Updates the CRON option with the new CRON array.
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*
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* @since 2.1.0
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* @access private
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*
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* @param array $cron Cron info array from {@link _get_cron_array()}.
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*/
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function _set_cron_array($cron) {
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$cron['version'] = 2;
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update_option( 'cron', $cron );
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}
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/**
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* Upgrade a Cron info array.
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*
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* This function upgrades the Cron info array to version 2.
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*
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* @since 2.1.0
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* @access private
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*
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* @param array $cron Cron info array from {@link _get_cron_array()}.
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* @return array An upgraded Cron info array.
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*/
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function _upgrade_cron_array($cron) {
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if ( isset($cron['version']) && 2 == $cron['version'])
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return $cron;
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$new_cron = array();
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foreach ( (array) $cron as $timestamp => $hooks) {
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foreach ( (array) $hooks as $hook => $args ) {
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$key = md5(serialize($args['args']));
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$new_cron[$timestamp][$hook][$key] = $args;
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}
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}
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$new_cron['version'] = 2;
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update_option( 'cron', $new_cron );
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return $new_cron;
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}
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