How to set cache time in php

php method to set cache time: first create a PHP sample file; then pass "if(is_file('./index.html') && (time()-filemtime('./index.html') )) < 60){...}" method to set the cache time.

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Operating environment for this tutorial:

• Windows7 system, PHP5.6 version

• Suitable for all brands of computers

php handles static pages: page settings Cache time

1. Page added cache time

2. Manual triggering method

3.crontab scheduled scanner

Let’s implement it Option 1: Add cache time to the page

用户请求页面 => 页面是否过期 =>
=> 否(获取静态页面) || =>是(动态页面生成一份新的静态页面)
if( 如果存在这个静态文件 && 没有过期){
    // 获取页面
}else{
    // 重新生成一份静态页面
}

ok, the basic logic is like this, let’s improve the code below:

<?php
if(is_file(&#39;./index.html&#39;) && (time()-filemtime(&#39;./index.html&#39;)) < 60){ 
    // 假设缓存时间是60秒
    // 获取页面
    require_once(&#39;./index.html&#39;);
}else{
    // 重新生成一份静态页面
    // 准备要展示到网页的数据
    $data = array( 
        array(&#39;id&#39;=>1,&#39;msg&#39;=>&#39;hello java&#39;),
        array(&#39;id&#39;=>2,&#39;msg&#39;=>&#39;hello php&#39;),
        array(&#39;id&#39;=>3,&#39;msg&#39;=>&#39;hello python&#39;),
    );
    // 渲染到模板
    // 实际项目一般是在html里渲染
    // 这里演示 希望能看懂
    ob_start(); // 开始输入缓冲控制
    foreach($data as $item){
        echo $item[&#39;id&#39;].&#39;===>&#39;.$item[&#39;msg&#39;].&#39;<br/>&#39;;
    }
    // 开始生成静态页面文件
    file_put_contents(&#39;index.html&#39;,ob_get_contents());
}

In this way we access index.php, if the static file cache has not expired, its actual access The content comes from the static file index.html.

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