PHP开发过程中,消息发布时间判断

<?php
header("Content-Type:text/html;charset=utf-8"); 
date_default_timezone_set(‘PRC‘); //设置中国时区 
//获取当前时间
$n = date("Y-m-d H:i:s");
$now = strtotime(date("Y-m-d H:i:s"));

//插入时间
$nnow = "1493782514";
$nn = date("Y-m-d H:i:s",$nnow);
echo "当前时间:".$n."<br/>
	  当前时间戳:".$now."<br/>
	  插入时间:".$nn."<br/>
	  插入时间戳:".$nnow."<br/>";
//exit();
$r = ‘‘;
$way = $now - $nnow;

if($way < 60){
	$r = ‘刚刚发布‘;
}elseif($way >= 60 && $way <3600){
	$r = floor($way/60).‘分钟前‘;
}elseif($way >=3600 && $way <86400){
	$r = floor($way/3600).‘小时前‘;
}elseif($way >=86400 && $way <2592000){
	$r = floor($way/86400).‘天前‘;
}elseif($way >=2592000 && $way <15552000){
	$r = floor($way/2592000).‘个月前‘;
}else{
	$r = "一年前";
}
echo $r;



?>