How can PHP developers ensure that scripts are only loaded once to avoid conflicts or errors?

To ensure that scripts are only loaded once in PHP, developers can use the `require_once` or `include_once` functions instead of `require` or `include`. These functions check if the script has already been loaded and if so, it will not load it again, preventing conflicts or errors. 

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

Keywords

PHP scripts loaded once conflicts errors

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