What are the potential pitfalls of using visible versus hidden fields in PHP forms for data retention?

Using visible fields in PHP forms for data retention can expose sensitive information to users and potentially lead to security vulnerabilities. It is recommended to use hidden fields instead to store and pass data between form submissions securely. 

<input type="hidden" name="user_id" value="<?php echo $user_id; ?>">

Keywords

visible fields hidden fields data retention PHP forms security risks

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