384 lines
11 KiB
PHP
384 lines
11 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 <= $timestamp + 600 )
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return;
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$crons = _get_cron_array();
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$key = md5(serialize($args));
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$crons[$timestamp][$hook][$key] = array( 'schedule' => false, 'args' => $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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* @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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$schedules = wp_get_schedules();
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$key = md5(serialize($args));
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if ( !isset( $schedules[$recurrence] ) )
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return false;
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$crons[$timestamp][$hook][$key] = array( 'schedule' => $recurrence, 'args' => $args, 'interval' => $schedules[$recurrence]['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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while ( $timestamp < time() + 1 )
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$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 mixed $args,... Optional. Event arguments.
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*/
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function wp_clear_scheduled_hook( $hook ) {
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$args = array_slice( func_get_args(), 1 );
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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( $local_time ) {
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/*
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* do not even start the cron if local server timer has drifted
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* such as due to power failure, or misconfiguration
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*/
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$timer_accurate = check_server_timer( $local_time );
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if ( !$timer_accurate )
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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( $crons );
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$timestamp = $keys[0];
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if ( $timestamp > $local_time )
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return;
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/*
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* multiple processes on multiple web servers can run this code concurrently
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* try to make this as atomic as possible by setting doing_cron switch
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*/
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$flag = get_transient('doing_cron');
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// clean up potential invalid value resulted from various system chaos
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if ( $flag != 0 ) {
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if ( $flag > $local_time + 10*60 || $flag < $local_time - 10*60 ) {
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set_transient('doing_cron', 0);
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$flag = 0;
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}
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}
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//don't run if another process is currently running it
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if ( $flag > $local_time )
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return;
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set_transient( 'doing_cron', $local_time + 30 );
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add_action('wp_head', 'spawn_cron_request');
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}
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/**
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* Run scheduled callbacks or spawn cron for all scheduled events.
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*
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* @since 2.1.0
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*
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* @return null When doesn't need to run Cron.
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*/
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function wp_cron() {
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// Prevent infinite loops caused by lack of wp-cron.php
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if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false )
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return;
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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]) && $keys[0] > time() )
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return;
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$local_time = time();
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$schedules = wp_get_schedules();
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foreach ( $crons as $timestamp => $cronhooks ) {
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if ( $timestamp > $local_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( $local_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' => 3600, 'display' => __('Once Hourly') ),
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'twicedaily' => array( 'interval' => 43200, 'display' => __('Twice Daily') ),
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'daily' => array( 'interval' => 86400, '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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// stub for checking server timer accuracy, using outside standard time sources
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function check_server_timer( $local_time ) {
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return true;
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}
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function spawn_cron_request() {
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?>
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<script type="text/javascript">
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/* <![CDATA[ */
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window.setTimeout(function(){var x;if(window.XMLHttpRequest){x=new XMLHttpRequest();}else{try{x=new ActiveXObject('Msxml2.XMLHTTP');}catch(e){try{x=new ActiveXObject('Microsoft.XMLHTTP');}catch(e){};}}if(x){x.open('GET','<?php echo get_option('siteurl'); ?>/wp-cron.php?'+(new Date()).getTime(), true);x.send('');}},10);
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/* ]]> */
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</script>
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<?php
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}
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?>
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