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Transients: Clear expired transients from the database in a daily cron task.

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Fixes #41699

Built from https://develop.svn.wordpress.org/trunk@41963


git-svn-id: http://core.svn.wordpress.org/trunk@41797 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Dion Hulse
2017-10-21 13:22:49 +00:00
parent f7fcb2cd5b
commit 26f9c6b909
5 changed files with 67 additions and 41 deletions
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55
wp-includes/option.php
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@@ -816,6 +816,61 @@ function set_transient( $transient, $value, $expiration = 0 ) {
return $result;
}
/**
* Deletes all expired transients.
*
* The multi-table delete syntax is used to delete the transient record
* from table a, and the corresponding transient_timeout record from table b. +
*
* @since 4.9.0
*
* @param bool $force_db Optional. Force cleanup to run against the database even when an external object cache is used.
*/
function delete_expired_transients( $force_db = false) {
global $wpdb;
if ( ! $force_db && wp_using_ext_object_cache() ) {
return;
}
$wpdb->query( $wpdb->prepare(
"DELETE a, b FROM {$wpdb->options} a, {$wpdb->options} b
WHERE a.option_name LIKE %s
AND a.option_name NOT LIKE %s
AND b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
AND b.option_value < %d",
$wpdb->esc_like( '_transient_' ) . '%',
$wpdb->esc_like( '_transient_timeout_' ) . '%',
time()
) );
if ( ! is_multisite() ) {
// non-Multisite stores site transients in the options table.
$wpdb->query( $wpdb->prepare(
"DELETE a, b FROM {$wpdb->options} a, {$wpdb->options} b
WHERE a.option_name LIKE %s
AND a.option_name NOT LIKE %s
AND b.option_name = CONCAT( '_site_transient_timeout_', SUBSTRING( a.option_name, 17 ) )
AND b.option_value < %d",
$wpdb->esc_like( '_site_transient_' ) . '%',
$wpdb->esc_like( '_site_transient_timeout_' ) . '%',
time()
) );
} elseif ( is_multisite() && is_main_site() && is_main_network() ) {
// Multisite stores site transients in the sitemeta table.
$wpdb->query( $wpdb->prepare(
"DELETE a, b FROM {$wpdb->sitemeta} a, {$wpdb->sitemeta} b
WHERE a.meta_key LIKE %s
AND a.meta_key NOT LIKE %s
AND b.meta_key = CONCAT( '_site_transient_timeout_', SUBSTRING( a.meta_key, 17 ) )
AND b.meta_value < %d",
$wpdb->esc_like( '_site_transient_' ) . '%',
$wpdb->esc_like( '_site_transient_timeout_' ) . '%',
time()
) );
}
}
/**
* Saves and restores user interface settings stored in a cookie.
*