How can PHP developers properly verify md5 encrypted passwords from a MySQL database in a login script?

When verifying md5 encrypted passwords from a MySQL database in a login script, PHP developers should retrieve the stored password hash from the database based on the provided username, then hash the input password using md5 and compare it with the stored hash. If the hashes match, the login is successful; otherwise, it fails. 

// Retrieve the stored password hash from the database based on the provided username
$query = "SELECT password FROM users WHERE username = :username";
$stmt = $pdo->prepare($query);
$stmt->execute(['username' => $username]);
$user = $stmt->fetch();

if ($user) {
    // Hash the input password using md5
    $input_password_hash = md5($password);

    // Compare the hashed input password with the stored hash
    if ($input_password_hash === $user['password']) {
        // Passwords match, login successful
        echo "Login successful!";
    } else {
        // Passwords do not match, login failed
        echo "Incorrect username or password";
    }
} else {
    // Username not found in the database
    echo "Incorrect username or password";
}

Keywords

PHP md5 MySQL password verification login script

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