How to write php entry file

First, let’s understand the running process of the framework:

Entry file-> Define constants-> Introduce function library-> Automatically load classes-> Start Framework-> Route Analysis-> Loading Controller-> Return Result

##Related recommendations: "

php Getting Started Tutorial"

Entry file index.php:

<?php
/*
入口文件
1.定义常量
2.加载函数库
3.启动框架
*/
// 定义当前框架所在的根目录
define(&#39;IMOOC&#39;, __DIR__);
// 定义框架核心文件所在的目录
define(&#39;CORE&#39;, IMOOC.&#39;/core&#39;);
// 项目文件所在目录
define(&#39;APP&#39;, IMOOC.&#39;/app&#39;);
// 定义项目调试模式
define(&#39;DEBUG&#39;, true);
// 判断项目是否处于调试状态
if (DEBUG) {
    // 设置报错级别：显示所有错误
    ini_set(&#39;display_error&#39;, &#39;On&#39;);
}else{
    ini_set(&#39;display_error&#39;,&#39;Off&#39;);
}
// 加载函数库
include CORE.&#39;/common/function.php&#39;;
// 加载框架核心文件
include CORE.&#39;/imooc.php&#39;;
\core\Imooc::run();

Public function function.php in the framework core directory:

<?php
/*
输出对应的变量或者数组
*/
function p($var){
    if(is_bool($var)){
        var_dump($var);
    }elseif (is_null($var)) {
        var_dump(NULL);
    }else{
        echo &#39;<pre style="position:relative;z-index:1000;padding:10px;border-radius:5px;background:#f5f5f5;
        border:1px solid #aaa;font-size:14px;line-height:18px;opacity:0.9;">&#39;.print_r($var,true).&#39;

'; } }

Framework core file imooc.php:

<?php
namespace core;
class Imooc
{
    static public function run()
    {
        p(&#39;ok&#39;);
    }
}

Run the project, After accessing the entry file index.php, the browser outputs: ok as expected.

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