What are potential pitfalls when using while loops in PHP for form processing?

Potential pitfalls when using while loops in PHP for form processing include the risk of infinite loops if the loop condition is not properly defined or updated within the loop. To avoid this, ensure that the loop condition is based on a variable that is updated within the loop to eventually evaluate to false.

// Example of using a while loop for form processing with proper condition updating
$valid = false;

while (!$valid) {
    // Process form data here

    // Update $valid based on form validation result
    if (/* form validation passes */) {
        $valid = true;
    }
}