What are the potential issues with including files in PHP scripts?

One potential issue with including files in PHP scripts is the risk of including a file multiple times, which can lead to redeclaration errors for functions or classes. To solve this problem, you can use the `require_once` or `include_once` functions instead of `require` or `include` to ensure that the file is only included once. 

<?php
require_once 'file.php';
?>

Keywords

include require file paths namespace conflicts security vulnerabilities

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