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php計算給定時間之前的函式

這裡給定一個時間,計算這個時間在多久前,比如:2天前,1年前

function prettyDate($date){
        $time = strtotime($date);
        $now = time();
        $ago = $now - $time;
        if($ago < 60){
            $when = round($ago);
            $s = ($when == 1)?"second":"seconds";
            return "$when $s ago";
        }
elseif($ago < 3600){ $when = round($ago / 60); $m = ($when == 1)?"minute":"minutes"; return "$when $m ago"; }elseif($ago >= 3600 && $ago < 86400){ $when = round($ago / 60 / 60); $h = ($when == 1)?"hour":"hours"; return
"$when $h ago"; }elseif($ago >= 86400 && $ago < 2629743.83){ $when = round($ago / 60 / 60 / 24); $d = ($when == 1)?"day":"days"; return "$when $d ago"; }elseif($ago >= 2629743.83 && $ago < 31556926){ $when = round($ago
/ 60 / 60 / 24 / 30.4375); $m = ($when == 1)?"month":"months"; return "$when $m ago"; }else{ $when = round($ago / 60 / 60 / 24 / 365); $y = ($when == 1)?"year":"years"; return "$when $y ago"; } }

使用:
echo prettyDate("2012-07-22 12:23:45")