Are there any specific PHP functions or methods that can help prevent variable duplication in includes?

Variable duplication in includes can be prevented by using the `include_once` or `require_once` functions instead of `include` or `require`. These functions ensure that the file is only included once, even if the include statement is encountered multiple times. By using `include_once` or `require_once`, you can avoid conflicts and errors caused by duplicate variable declarations. 

<?php
// Include file with require_once
require_once 'myfile.php';

// Include file with include_once
include_once 'anotherfile.php';
?>

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PHP functions methods prevent variable duplication includes

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