What are the potential pitfalls of using disabled input fields in PHP forms?

Using disabled input fields in PHP forms can lead to potential security risks as the disabled attribute can be easily manipulated by users. Instead, it is recommended to use hidden input fields to store sensitive information that should not be edited by users. 

<form method="post" action="process_form.php">
  <input type="hidden" name="user_id" value="<?php echo $user_id; ?>">
  <input type="text" name="username" value="<?php echo $username; ?>" disabled>
  <input type="submit" value="Submit">
</form>

Keywords

disabled input fields PHP forms data submission user input validation security vulnerabilities

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