How can developers ensure the security of user input in PHP forms, especially when comparing sensitive data like passwords?

Developers can ensure the security of user input in PHP forms, especially when comparing sensitive data like passwords, by using secure hashing algorithms like bcrypt to securely store and compare passwords. Additionally, developers should always sanitize and validate user input to prevent SQL injection and other security vulnerabilities. 

// Hashing and storing a password securely
$password = $_POST['password'];
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

// Comparing a user input password with the hashed password
$user_input_password = $_POST['user_input_password'];
$stored_password = "hashed_password_from_database";

if (password_verify($user_input_password, $stored_password)) {
    // Passwords match
    // Proceed with the authentication process
} else {
    // Passwords do not match
    // Handle the error or redirect back to the login page
}

Keywords

SQL injection cross-site scripting password hashing prepared statements input validation

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