chamilo-lms/main/lp/lp_ajax_start_timer.php

<?php
/* For licensing terms, see /license.txt */

/**
 * @package chamilo.learnpath
 * @author Yannick Warnier <ywarnier@beeznest.org>
 */

/**
 * Start a timer and hand it back to the JS by assigning the current time (of start) to
 * var asset_timer
 * @return string JavaScript time intializer
 */
function start_timer()
{
    $time = time();
    return $time; //"olms.asset_timer='$time'; olms.asset_timer_total = 0;";
}

echo start_timer();