What are some potential security risks of using PHP for user authentication on a website?

One potential security risk of using PHP for user authentication is the possibility of SQL injection attacks if user input is not properly sanitized. To mitigate this risk, developers should use prepared statements or parameterized queries to prevent malicious SQL queries from being executed. 

// Using prepared statements for user authentication
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = ? AND password = ?');
$stmt->execute([$username, $password]);
$user = $stmt->fetch();

if ($user) {
    // Authentication successful
} else {
    // Authentication failed
}

Keywords

SQL injection Cross-site scripting (XSS) Session hijacking Password hashing CSRF (Cross-Site Request Forgery)

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