What are some best practices for managing paths and variables in PHP to avoid repetitive code?

When managing paths and variables in PHP to avoid repetitive code, it is best to use constants for paths and variables that are used frequently throughout your application. By defining constants, you can easily update values in one place without having to search and replace them throughout your codebase. This practice not only reduces the chances of errors but also makes your code more maintainable. 

<?php

// Define constants for paths
define('APP_PATH', '/path/to/your/application/');
define('INCLUDES_PATH', APP_PATH . 'includes/');
define('TEMPLATES_PATH', APP_PATH . 'templates/');

// Define constants for variables
define('MAX_USERS', 100);
define('DEFAULT_LANGUAGE', 'en');

// Usage example
include(INCLUDES_PATH . 'header.php');
echo 'Max users allowed: ' . MAX_USERS;
echo 'Default language: ' . DEFAULT_LANGUAGE;

?>

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