时间戳转换为时分秒

   public static  function secsToStr($secs="")
    {
        $r = '';
        if ($secs >= 3600) {
            $hours = floor($secs / 3600);
            $secs = $secs % 3600;
            $r.= $hours;
            if ($hours <> 1) {
                $r.= ':';
            }
        }
        if ($secs >= 60) {
            $minutes = floor($secs / 60);
            $secs = $secs % 60;
            $r .= $minutes;
            if ($minutes <> 1) {
                $r.= ':';
            }
        }
        $r.= $secs;
       return  $r;
    }