17位的时间戳

function get_millisecond()
{
    list($usec, $sec) = explode(" ", microtime());
    $msec=round($usec*1000);
    return $msec;

}

    /**
     * @return string 17位时间戳
     */
    public function time_17(){
        $millisecond = get_millisecond();
        $millisecond = str_pad($millisecond,3,'0',STR_PAD_RIGHT);
        return strval(date("YmdHis").$millisecond);
    }