php返回相对时间（如：20分钟前，3天前）的方法

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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 $diff." 分钟".plural($diff)." 前";

$diff = round($diff/60);

if ($diff<24)

return $diff." 小时".plural($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));

}