What is the purpose of using include_once() or require_once in PHP scripts?

When including a file in PHP, using include() or require() can lead to errors if the file is included more than once. To prevent this, you can use include_once() or require_once() functions, which will check if the file has already been included and only include it once. 

<?php
require_once('file.php');
// Code that uses functions or classes from file.php
?>

Keywords

include_once require_once PHP scripts code reusability error prevention

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