What are the potential security risks associated with using the mysql extension in PHP for database interactions, and what alternative solutions like mysqli or PDO should be considered?

Using the mysql extension in PHP for database interactions poses security risks such as SQL injection attacks due to its lack of prepared statements. It is recommended to use either mysqli or PDO, which provide prepared statements and parameterized queries to prevent SQL injection vulnerabilities.

// Using PDO for secure database interactions
try {
    $pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");
    $stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
    $stmt->bindParam(':username', $username);
    $stmt->execute();
    $result = $stmt->fetchAll();
} catch (PDOException $e) {
    echo "Error: " . $e->getMessage();
}