Facebook Timespan

function facebook_timespan($timestamp)
{
    if($timestamp == '' or !is_numeric($timestamp))
        return '';
    $hari   = date('l',$timestamp);
    $tgl    = date('d',$timestamp);
    $bln    = date('F',$timestamp);
    $thn    = date('Y',$timestamp);
    $pukul  = date('H:i',$timestamp);
    // timespan dari CI's date helper
    $timespan = strtolower(timespan($timestamp));
    $timespan = str_replace(',','',$timespan);
    $exp = explode(' ',$timespan);
    $k = $exp[1];
    $v = $exp[0];
    if($v > 0)
    {
        if (stristr($k,'year') OR date('Y') > $thn)
        {
            return $tgl.' '.$bln.' '.$thn;
        }
        elseif (stristr($k,'week') OR stristr($k,'month'))
        {
            return $tgl.' '.$bln.' at '.$pukul;
        }
        elseif (stristr($k,'day') OR stristr($k,'hour') OR stristr($k,'minute') OR stristr($k,'second'))
        {
            if($v >= 2 AND stristr($k,'day'))
            {
                return $hari.' at '.$pukul;
            }
            elseif (date('j') - date('j', $timestamp) == 1)
            {
                return 'Yesterday at '.$pukul;
            }
            elseif ((date('D') == date('D', $timestamp)) AND (($v >= 10) AND stristr($k,'hour')))
            {
                return 'Today at '.$pukul;
            }
            elseif ((stristr($k,'hour') AND $v < 10) OR stristr($k,'minute') OR stristr($k,'second'))
            {
                if(stristr($k,'second') AND $v <= 15)
                {
                    return 'just now';
                }
                return $v.' '.$k.' ago';
            }
            else
            {
                return $hari.' at '.$pukul;
            }
        }
    }
    else
    {
        return 'just now';
    }
}