require_once needs to pay attention to the problem and set the include path

Set common files that need to be included: (in the project root directory)

include.php

<?php
    header("content-type:text/html;charset=utf-8");
    date_default_timezone_get("PRC");
    session_start();
    //_FILE_返回是当前代码所在文件（而不是url所在文件）完整（绝对）路径
    //dirname($file_name)返回$file_name所在层目录名
    define("ROOT",dirname(FILE));
    set_include_path(".".PATH_SEPARATOR.ROOT."/core".PATH_SEPARATOR.ROOT."/configs".PATH_SEPARATOR.get_include_path());
    require_once &#39;mysql.func.php&#39;;
    require_once &#39;image.func.php&#39;;
    require_once &#39;common.func.php&#39;;
    require_once &#39;string.func.php&#39;;
    require_once &#39;page.func.php&#39;;
    require_once &#39;configs.php&#39;;
    require_once &#39;admin.inc.php&#39;;
    require_once &#39;cate.inc.php&#39;;
    require_once &#39;pro.inc.php&#39;;
    require_once &#39;album.inc.php&#39;;
    require_once &#39;user.inc.php&#39;;
    require_once &#39;upload.func.php&#39;;
    connect();
?>

Then, other pages directly require_once(' ./include.php') //relative to the path of include.php

But problems may occur when files are nested and included

The following is a detailed explanation

Click to open the link

Therefore, to be safe, it is best to add dirname(FILE) at the beginning of

require_once (dirname(FILE).'/'.'../include.php');

.'/'

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