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PHP定时更新程序设计思路分享_PHP

Jun 01, 2016 am 11:53 AM
php

现在回想起来,我以前的想法是错误的,网页的执行流程

 打开WEB页面 —- 加载HTML代码 (包括CSS,javascript)— 执行PHP代码 — 完成

粗约的就先理解成上面的这个样子。

我们都知道PHP做成服务器端的脚本,它是有超时设置的,可以通过 set_time_limit() 函数来处理。但这样处理PHP代码十分

消耗CPU资源。所以不建议通过循环处理PHP代码来实现。

一般的情况是用javascript来处理。

复制代码 代码如下:
$(function(){
    var tims = 1000*60*60*10; //设置延迟处理的时间,这里设置的是10个小时
      setInterval(function(){
    //要执行的码
        $.post("./data.php",{ postdata },function(datas){
            if(id.data == 1)
            {
              $("body").append(id.info+"
");
            }
     });
},tims);
    },json);

上面是WEB前台要执行的javascript代码,通过延时执行ajax来达到自动处理的效果

php后台处理代码,就简单了,只要接受从前台POST过来的数据就可以了。然后将数据处理后存入数据库。

就这么简单,只是,页面不能关,这个你可以理解成软件的后台程序。

其实一个软件分为:前端,后端,服务器端。前端和后端都是在你电脑上运行的。

 

腾讯软件后台程序
后台程序只有通过任务管理器才监控的到,但它都做了什么事?你根本就不知道。

360才能如“工蜂”般窃取你的隐私,QQ才能获取的cookie。

不多说了,这样是软件设计模式的一种,能懂就可以了。

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