What potential pitfalls should be considered when using PHP in conjunction with Flash?

One potential pitfall when using PHP in conjunction with Flash is the security vulnerability of passing user input directly from Flash to PHP without proper validation. This can lead to SQL injection attacks or other security breaches. To mitigate this risk, always validate and sanitize user input before passing it to PHP scripts.

// Example of validating and sanitizing user input before passing it to PHP script
$user_input = $_POST['user_input'];
$clean_input = filter_var($user_input, FILTER_SANITIZE_STRING);

// Use $clean_input in your PHP script to prevent SQL injection attacks or other security breaches