php返回相對時間(如：20分鐘前，3天前)的方法

    本文實例講述了php返回相對時間（如：20分鐘前，3天前）的方法。分享給大家供大家參考。具體如下：
    function plural($num) {
    if ($num != 1)
    return "s";
    }
    function getRelativeTime($date) {
    $diff = time() - strtotime($date);
    if ($diff<60)
    return $diff." 秒".plural($diff)." 前";
    $diff = round($diff/60);
    if ($diff<60)
    return $diff." 分鐘".plural($diff)." 前";
    $diff = round($diff/60);
    if ($diff<24)
    return $diff." 小時".plural($diff)." 前";
    $diff = round($diff/24);
    if ($diff<7)
    return $diff." 天".plural($diff)." 前";
    $diff = round($diff/7);
    if ($diff<4)
    return $diff." 星期".plural($diff)." 前";
    return "on ".date("F j, Y", strtotime($date));
    }