<?php

	echo (time_fitle('2016-08-17 17:00:00'));

	function time_fitle($date){

        date_default_timezone_set('PRC');

        //得到相差的秒

        $_sec = time()-strtotime($date);

		//如果超过当前时间返回false

        if($_sec<0)return false;

        //得到相差的分钟

        $_min = floor($_sec/60);

        //得到相差的小时

        $_hour = floor($_sec/3600);

        //得到相差的天

        $_day = floor($_sec/86400);

        //得到相差的周

        $_week = floor($_sec/604800);

        $txt = '';

        if($_min < 15){

        	$txt = '刚刚';

        }else if($_min >=15 && $_min<30){

        	$txt = '15分钟前';

        }else if($_min >=30 && $_min<60){

        	$txt = '半小时前';

        }else if($_hour<24){

        	$txt = $_hour."小时前";

        }else if($_day<7){

        	$txt = $_day."天前";

        }else if{

			$txt = $_week."周前";

        }

        //只写到了周 其他模仿写即可

        return $txt;

	}

?>