Tips to simplify single-file relative path management

Question

How to manage relative paths in a project from a single file, since editing or updating is cumbersome and I would like to have a separate file to handle it.

//Redirect to home page if role is user, otherwise redirect to admin dashboard
   if ($_SESSION['role'] === 'user') {
     header('location: ./../../index.php'); // this
   } else {
     header('location: ./../../admin/index.php'); // this
   }

Manage paths to a single file for the entire project

Answer 1

For example, create a new file and name it config.php (or any other name you like) and write these lines in it as follows:

<?php
  //`__DIR__` 是一个代表当前脚本所在目录的魔术常量
  //根据您的项目结构，调整路径拼接（`BASE_PATH .`）。
    
   define('BASE_PATH', __DIR__ . '/');
?>

Now you can easily include config.php in any file that needs to use the base path!

<?php
    require_once 'config.php';

    if ($_SESSION['role'] === 'user') {
        header('location: ' . BASE_PATH . 'index.php');
    } else {
        header('location: ' . BASE_PATH . 'admin/index.php');
    }
?>