Are there any potential pitfalls or issues to be aware of when including Google Analytics code in a PHP include file?

One potential issue when including Google Analytics code in a PHP include file is that it may not track page views correctly if the include file is included multiple times on the same page. To solve this, you can check if the Google Analytics code has already been included before including it again. 

<?php
if (!defined('GA_TRACKING_CODE_INCLUDED')) {
    define('GA_TRACKING_CODE_INCLUDED', true);
    // Google Analytics tracking code goes here
}
?>

Keywords

Google Analytics PHP include tracking code cross-domain tracking asynchronous tracking

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