What are the security implications of using hidden fields to pass sensitive data in PHP forms?

Using hidden fields to pass sensitive data in PHP forms can pose a security risk as the data can be easily manipulated by attackers. To mitigate this risk, sensitive data should never be passed through hidden fields. Instead, it should be stored securely on the server side and accessed only when necessary.

// Store sensitive data securely on the server side
$sensitiveData = "example";

// Access the sensitive data when needed
echo $sensitiveData;