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PHP自动更新生成首页

Jun 06, 2016 pm 07:46 PM
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欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 我们知道,访问动态页面是即时从服务器读取数据的,当访客越来越多的时候,速度会很慢,而生成的静态页面不仅速度快可以解决服务器的压力问题,而且对于SEO搜索引擎来说也是非常友好的。 已经很少有

欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入

  我们知道,访问动态页面是即时从服务器读取数据的,当访客越来越多的时候,速度会很慢,而生成的静态页面不仅速度快可以解决服务器的压力问题,而且对于SEO搜索引擎来说也是非常友好的。

  已经很少有人再采用动态直接读取数据了,现在网页基本上都是采用静态html了,网站首页可以说是访问频率最高的页面了,当然也是更新频率最高的地方,那么怎样保证首页即是静态 html 文件,又可以及时进行更新就成为一个问题。

  在更新夏日文章系统时,就遇到了这个问题,怎样去触发用户自动更新首页,首先了解一下源理,如果仅仅去更新首页为静态 html,那么很简单,利用 php 操作文件函数 file_put_contents() 打开首页进行读取,再利用 php 操作文件的函数进行写入,就可以直接生成静态 html 文件,而这个操作都是后台进行的,可是缺点是不能进行使用户来触发生成静态首页。

  下面来理清一个思路,首先生成静态页面有了,那么怎样自动更新首页呢?其实自动更新首页就是判断时间,在 wp 系统中,就有自动发布文章的设置,例如下面代码:if(format_date(time(),1)>"20131001″){echo "自动更新代码";},20131001 更改为有一定规律的时间即可。

  但我并不想使用上述的方法来实现,需要注意的事,这个生成首页是用每次更新前的访问用户来触发生成静态首页的,按照上述的原理,那么代码就很简单,用来更新首页的完全够了。

  

  $nowtime=time();

  $pastsec = $nowtime - $_GET["t"];

  if($pastsec

  {

  exit; //30秒更新一次,时间可以自己调整

  }

  ob_start(); //打开缓冲区

  include("index.php"); //包含生成的文件,比如首页

  $content = ob_get_contents(); //得到缓冲区的内容

  $content .= ""; //加上调用更新程序的代码

  file_put_contents("index.html",$content); //写入生成 index.html

  if (!function_exists("file_put_contents")) //读取写入

  {

  function file_put_contents($fn,$fs)

  {

  $fp=fopen($fn,"w+");

  fputs($fp,$fs);

  fclose($fp);

  }

  }

  echo date("Y-m-d H:i:s"); //写入生成时间

  echo "静态首页成功更新!" //生成成功,实际应用中可删除掉

  ?>

  直接运行,你会发现首页页面下面出现"当前时间,静态首页成功更新"的文字,这时再看网站根目录下,会多出一个 index.html 文件,这就是生成的静态html文件了。打开这个文件,可以看到里面多出一段代码:"

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