src/Helpers/XHProf.php
public static function start()
    {
        self::$_isStarted = true;
        if (self::$_isEnabled && function_exists("xhprof_enable")) {
            xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
        }
    }
public static function start()
    {
        self::$_isStarted = true;
        if (self::$_isEnabled && function_exists("xhprof_enable")) {
            xhprof_enable(XHPROF_FLAGS_CPU + XHPROF_FLAGS_MEMORY);
        }
    }
Start XHProf