How can PHP developers securely store and manage user credentials in a database for user authentication?

To securely store and manage user credentials in a database for user authentication, PHP developers should use hashing algorithms like bcrypt to securely store passwords. When a user registers or updates their password, the password should be hashed before storing it in the database. When a user logs in, their input password should be hashed and compared to the hashed password stored in the database. 

// Register or update user password
$password = 'user_password';
$hashed_password = password_hash($password, PASSWORD_BCRYPT);

// Store $hashed_password in the database

// User login
$input_password = 'user_input_password';

// Retrieve hashed password from the database
$stored_hashed_password = 'hashed_password_from_database';

if (password_verify($input_password, $stored_hashed_password)) {
    // Passwords match, authenticate user
    echo 'User authenticated';
} else {
    // Passwords do not match, deny access
    echo 'Invalid credentials';
}

Keywords

password hashing secure storage database encryption user authentication PHP security

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