What are the potential pitfalls of using full URLs instead of file paths in PHP includes?

Using full URLs instead of file paths in PHP includes can lead to security vulnerabilities, as it allows for remote file inclusion attacks. To mitigate this risk, it is recommended to use file paths instead of URLs when including files in PHP scripts. By using file paths, you ensure that only files within your server's file system can be included, reducing the risk of unauthorized access to sensitive files.

// Instead of using full URLs, use file paths for includes
include_once(__DIR__ . '/path/to/file.php');