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- add_action( 'wp_scheduled_delete', 'delete_expired_db_transients' );
- function delete_expired_db_transients() {
- global $wpdb, $_wp_using_ext_object_cache;
- if( $_wp_using_ext_object_cache )
- return;
- $time = isset ( $_SERVER['REQUEST_TIME'] ) ? (int)$_SERVER['REQUEST_TIME'] : time() ;
- $expired = $wpdb->get_col( "SELECT option_name FROM {$wpdb->options} WHERE option_name LIKE '_transient_timeout%' AND option_value < {$time};" );
- foreach( $expired as $transient ) {
- $key = str_replace('_transient_timeout_', '', $transient);
- delete_transient($key);
- }
- }
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