Are there any best practices for including pages from different folders in PHP to avoid errors like failed opening required 'include.php'?

When including files from different folders in PHP, it's important to use the correct file path to avoid errors like 'failed opening required'. One best practice is to use the `__DIR__` magic constant to reference the current directory and build the file path from there. This ensures that the include path is always correct regardless of the current working directory.

<?php
include __DIR__ . '/folder/include.php';
?>