Humanise date diff - ie, 3 days ago etc.

humanise_date_diff

function datediff($timestamp)
{
    $difference = time() - strtotime($timestamp);

    if($difference < 60){
        $s = ($difference == '1' ? '' : 's');
        return $difference." second$s ago";
    }else{
        $difference = round($difference / 60);
        if($difference < 60){
            $s = ($difference == '1' ? '' : 's');
            return $difference." minute$s ago";
        }else{
            $difference = round($difference / 60);
            if($difference < 24){
                $s = ($difference == '1' ? '' : 's');
                return $difference." hour$s ago";
            }else{
                $difference = round($difference / 24);
                if($difference < 7){
                    $s = ($difference == '1' ? '' : 's');
                    return $difference." day$s ago";
                }else{
                    return date('H:i:s',strtotime($timestamp));
                }
            }
        }
    }
}