How does include() differ from traditional functions in PHP, and what considerations should be taken when using it for file inclusion?

include() in PHP is a language construct used to include and evaluate the specified file during the execution of the script. It differs from traditional functions in that it includes and evaluates the specified file at runtime, which can be useful for reusing code across multiple files. When using include() for file inclusion, it's important to consider the file path, error handling, and security implications to prevent issues like file not found errors or potential security vulnerabilities.

<?php
include('path/to/file.php');
?>