将时间转换为xxx天前 xxx..前

<?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;
	}
?>