How can beginners in PHP ensure secure and efficient inclusion of files using PHP scripts?

Beginners in PHP can ensure secure and efficient inclusion of files by using the `include_once` or `require_once` functions instead of `include` or `require`. This prevents the same file from being included multiple times, reducing the risk of errors or conflicts. Additionally, it is important to validate user input and sanitize file paths to prevent directory traversal attacks. 

<?php
// Secure and efficient inclusion of files using require_once
require_once 'file.php';
?>

Keywords

File inclusion PHP scripts security efficiency beginners

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