Sql debugger for wp

define('SAVEQUERIES', true);
add_action('shutdown', 'sql_logger');
function sql_logger() {
    global $wpdb;
    $log_file = fopen(ABSPATH.'/sql_log.txt', 'a');
    fwrite($log_file, "//////////////////////////////////////////\n\n" . date("F j, Y, g:i:s a")."\n");
    foreach($wpdb->queries as $q) {
        fwrite($log_file, $q[0] . " - ($q[1] s)" . "\n\n");
    }
    fclose($log_file);
}