In the provided PHP code snippet, what potential pitfalls or errors can be identified, and how can they be addressed to improve functionality?

One potential pitfall in the provided PHP code snippet is the use of the `$_POST` superglobal without proper validation or sanitization, which can make the code vulnerable to security risks like SQL injection attacks. To address this issue, you should sanitize user input before using it in SQL queries to prevent malicious code execution. 

// Sanitize user input before using it in SQL queries
$username = isset($_POST['username']) ? filter_var($_POST['username'], FILTER_SANITIZE_STRING) : '';
$password = isset($_POST['password']) ? filter_var($_POST['password'], FILTER_SANITIZE_STRING) : '';

// Use prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

PHP code snippet errors functionality improvement

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