Solution to the problem that the file introduced by the PHP require_once() function cannot be found

Today I used php to write a simple Android login server code. I encountered a particularly depressing thing, using require_once() An error message appears for the file introduced into the php file and the file cannot be found.

require_once() in php is mainly used to introduce one php file into another php file. Let me first talk about the problems I encountered. My directory structure is like this:

This is what I wrote in user.class.php:

require_once("../config/mysqlConfig.php");require_once('../util/HandleMysql.class.php');

It looks really good, but I am The code user.class.php

require_once("class/user.class.php");

looks good, but the following error is reported when running:

I thought about it and finally found the problem:
require_once()Function actually puts the code of the file you included into the location where you referenced, that is to say , after the above two references, in fact, the index.php file now looks like this

require_once("../config/mysqlConfig.php");require_once('../util/HandleMysql.class.php');

Then index.php follows this path to find these two The file, of course, cannot be found.
It seems that relative paths should be used with caution in actual development.

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