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<?php
/*
Adapted from Purge Transients by Seebz
https://github.com/Seebz/Snippets/tree/master/Wordpress/plugins/purge-transients
*/
if ( ! function_exists( 'jp_purge_transients' ) ) {
/**
* Jetpack Purge Transients.
*
* @access public
* @param string $older_than (default: '1 hour') Older Than.
* @return void
*/
function jp_purge_transients( $older_than = '1 hour' ) {
global $wpdb;
$older_than_time = strtotime( '-' . $older_than );
if ( $older_than_time > time() || $older_than_time < 1 ) {
return false;
}
$sql = $wpdb->prepare( "
SELECT REPLACE(option_name, '_transient_timeout_jpp_', '') AS transient_name
FROM {$wpdb->options}
WHERE option_name LIKE '\_transient\_timeout\_jpp\__%%'
AND option_value < %d
", $older_than_time );
$transients = $wpdb->get_col( $sql );
$options_names = array();
foreach ( $transients as $transient ) {
$options_names[] = '_transient_jpp_' . $transient;
$options_names[] = '_transient_timeout_jpp_' . $transient;
}
if ( $options_names ) {
$option_names_string = implode( ', ', array_fill( 0, count( $options_names ), '%s' ) );
$delete_sql = "DELETE FROM {$wpdb->options} WHERE option_name IN ($option_names_string)";
$delete_sql = call_user_func_array( array( $wpdb, 'prepare' ), array_merge( array( $delete_sql ), $options_names ) );
$result = $wpdb->query( $delete_sql );
if ( ! $result ) {
return false;
}
}
return;
}
}
/**
* Jetpack Purge Transients Activation.
*
* @access public
* @return void
*/
function jp_purge_transients_activation() {
if ( ! wp_next_scheduled( 'jp_purge_transients_cron' ) ) {
wp_schedule_event( time(), 'daily', 'jp_purge_transients_cron' );
}
}
add_action( 'admin_init', 'jp_purge_transients_activation' );
add_action( 'jp_purge_transients_cron', 'jp_purge_transients' );
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