function dateFormat ret explode datetoday date Y-m-D if datetoday time

function dateFormat($a)
    {
        $ret = ''
        $a = explode(" ", $a);
        $datetoday = date("Y-m-D");
        if($a[0] == $datetoday)
        {
            $time = explode(":", $a[1]);
            $time = $time[0].":".$time[1];
            $ret = "$time, сегодня";
        }
        else
        {
            $ret = "sdfsdfsf";
        }
        return $ret;
    }