What are some potential security risks associated with handling checkboxes in PHP forms?

One potential security risk associated with handling checkboxes in PHP forms is unchecked checkboxes not being properly validated, allowing malicious users to manipulate form data. To mitigate this risk, always ensure that checkboxes are properly validated and sanitized before processing the form submission.

// Validate and sanitize checkbox input
$checkbox_value = isset($_POST['checkbox_name']) ? 'checked' : 'unchecked';