本文实例讲述了php返回相对时间（如：20分钟前，3天前）的方法。分享给大家供大家参考。具体如下：
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));
}
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