Why do requires and includes fail to add files that are in directories above the call file?

Question

I realized that require and includes cannot include files that are above the call file directory. Because this occurs?

Example:

It works:

<?php require_once('inc/configs.php'); ?>

That doesn’t work:

<?php require_once('../template/header-home.php'); ?>

That is, if you have to add a file that is above the directory of the call file, it gives error saying that the file was not found.

Answer 1

You can access it! just know the simple technique.

Note: What I’ll need is:

C:\xampp\htdocs\slug.php

The file I’ll use to include "slug.php" is:

C:\xampp\htdocs\uploads\updoc.php

In the hall "updoc.php" goes the simple code:

<?php
include_once("\..\slug.php");

it’s very simple to access files wherever he is.

If the file "Slug.php" is in the folder "xampp" next to the folder "aploads"

In Windows would be:

<?php
include_once("\..\\xampp\slug.php");

I hope I’ve helped!

Answer 2

Try to use the constant __DIR__:

require_once(__DIR__ . '/../template/header-home.php');