What are some common security risks associated with using PHP for login systems?

One common security risk associated with using PHP for login systems is the vulnerability to SQL injection attacks. To prevent this, developers should use prepared statements with parameterized queries to sanitize user input and prevent malicious SQL code from being executed. 

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username AND password = :password');
$stmt->execute(['username' => $username, 'password' => $password]);
$user = $stmt->fetch();

Keywords

SQL injection Cross-site scripting (XSS) Session hijacking Password hashing Two-factor authentication

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