initial commit

hamrokhaanpaan/wp-cron.php

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+<?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 a scheduled cron event runs.
+ *
+ * @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', '>=' ) ) {
+	if ( ! headers_sent() ) {
+		header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
+		header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
+	}
+
+	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 __DIR__ . '/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, try to grab 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_wp_cron        = sprintf( '%.22F', microtime( true ) );
+		$doing_cron_transient = $doing_wp_cron;
+		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 ) {
+				wp_reschedule_event( $timestamp, $schedule, $hook, $v['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();