How can PHP developers ensure secure user authentication and authorization in a web application?

To ensure secure user authentication and authorization in a web application, PHP developers should use secure hashing algorithms like bcrypt to store passwords, implement CSRF protection, use prepared statements to prevent SQL injection attacks, and validate user input to prevent XSS attacks. 

// Example code snippet for secure user authentication using bcrypt hashing

// Password hashing
$password = 'user_password';
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

// Storing hashed password in database
// INSERT INTO users (username, password) VALUES ('user', '$hashed_password');

// User login
$entered_password = 'user_password';
$stored_hashed_password = 'retrieved hashed password from database';

if (password_verify($entered_password, $stored_hashed_password)) {
    // Passwords match, user is authenticated
    echo 'User authenticated';
} else {
    // Passwords do not match, authentication failed
    echo 'Authentication failed';
}

Keywords

password hashing session management CSRF protection role-based access control secure cookie handling

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