WordPress ~ Close database connections - #security #optimisation

functions.php

<?php

/**
 * Close database connections
 * 
 * It's very dangerous to let connections opened. In a website
 * with high traffic volume, you can kill your database just
 * because of unclosed DB connections.
 * This little snippet prevent that drama ;)
 * 
 * @uses mysql_close() To close all DB connections.
 * @see https://github.com/crewstyle/clean-wordpress
 */
add_action('shutdown', '_cw_close_db_link', 99);
function _cw_close_db_link()
{
  global $wpdb;
  unset($wpdb);
}