PHP true static cache ob system function PHP function return value PHP array PHP date function-PHP Tutorial-php.cn

PHP true static cache ob system function PHP function return value PHP array PHP date function

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Release： 2016-07-29 08:53:24

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True static cache: (really generates an html page and calls the html directly in the next operation)
The first time (refresh the web page) to determine whether there is a cache file (can be set for a time)
If it does not exist, the first time is to connect to the database (according to PDO), find the data, output it to the page, and cache (write) it to a local .html file at the same time;
Again (refresh the web page) to determine whether the cache file exists
When a cache file exists, directly search the local cache (file_get_content) and read it out

The following code is written in the ci framework

<code><span>$time</span> = <span>10</span>; <span>//设置缓存页面过期时间</span><span>if</span>(!is_file(<span>"obtest.html"</span>) || time()-filemtime(<span>"obtest.html"</span>)><span>$time</span>){
ob_start();       <span>//打开缓冲区   </span><span>$arr</span>[<span>'res'</span>]=<span>$this</span>->db->get(<span>'user'</span>)->result_array();
<span>$this</span>->load->view(<span>'welcome_message'</span>,<span>$arr</span>);
<span>//print_r($arr);</span><span>$info</span> = ob_get_contents();       <span>//得到缓冲区的内容并且赋值给$info   </span><span>$file</span> = <span>fopen</span>(<span>'obtest.html'</span>, <span>'w'</span>);  <span>//打开文件info.txt   </span><span>fwrite</span>(<span>$file</span>, <span>$info</span>);       <span>//写入信息到info.txt   </span><span>fclose</span>(<span>$file</span>);          <span>//关闭文件info.txt</span>
}<span>else</span>{
    echo <span>"cache:"</span>;
    echo file_get_contents(<span>"obtest.html"</span>);
}
</code>

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fopen and filemtime methods are used:

<code><span><span>fopen</span><span>()</span> 函数打开文件或者 URL。<span>fopen</span>（文件名称，文件访问类型）<span>w</span>写入方式打开。

<span>filemtime</span><span>()</span> 函数返回文件内容上次的修改时间，里面跟文件名。</span></code>

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The above introduces the php true static cache ob system functions, including php and function content. I hope it will be helpful to friends who are interested in PHP tutorials.