<?php
//计算第一次项目开始到现在的时间
date_default_timezone_set('PRC');
function timecha($time){
    //先进行判断$time是否为合理化数字is_numeric判断
    if(is_numeric($time)){
        $value=array(
            "year"=>0,"month"=>0,"day"=>0,"hours"=>0,"minute"=>0,"second"=>0
        );/*初始化时间的关联列表*/
        if($time>=31556926){
            $value['year']=floor($time/31556926);
            $time=($time%31556926);//取余求得年之外的时间
        }
        if ($time>=2592000){
            $value['month']=floor($time/2592000);//上次取余数的秒除以月秒数
            $time=($time%2592000);//取余数月之外的当做天
        }
        if ($time>=86400){
            $value['day']=floor($time/86400);
            $time=($time%86400);//取余数的时间戳当做小时的戳
        }
        if ($time>=3600){
            $value['hours']=floor($time/3600);
            $time=($time%3600);//取余数的时间戳当做分钟的戳
        }
        if ($time>=60){
            $value['minute']=floor($time/60);
            $time=($time%60);//取余数的时间戳当做秒的戳
        }
        /*if ($time<60){
            $value['second']=$time;
            }*/$value["second"] = floor($time);
        return (array)$value;//返回数组value值

    }
    else {
        return false;
    }/*条件分支结束*/

}


$startime=strtotime('2017-12-11 10:20:00');//获取开始时间戳
$time=time()-$startime;//获取时间差的时间戳
$nowtime=timecha($time);//将函数的参数传给一个变量
?>
软件172班我的博客项目已经开始:<span> <?php echo $nowtime['year'];?>年<?php echo $nowtime['month']?>月<?php echo $nowtime['day']?>日<?php echo $nowtime['hours']?>时<?php echo $nowtime['minute']?>分<?php echo $nowtime['second']?>秒</span>

上述就可实现网站计时功能，结合数组函数实现，后续可是使用js获取倒计时，时时显示！