What are common pitfalls when passing form data to functions in the same PHP file?

Common pitfalls when passing form data to functions in the same PHP file include not properly sanitizing input data, not validating input data, and not handling errors effectively. To solve this, always sanitize and validate input data before passing it to functions, and implement error handling to gracefully handle any issues that may arise. 

<?php
// Sanitize input data
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_STRING);

// Validate input data
if (!empty($username) && !empty($password)) {
    // Call function with sanitized input data
    processLogin($username, $password);
} else {
    echo "Please enter both username and password.";
}

// Function to process login
function processLogin($username, $password) {
    // Your login logic here
}
?>

Keywords

PHP form data functions validation security

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