How can developers ensure the security and efficiency of their PHP code when interacting with a MySQL database?

Developers can ensure the security and efficiency of their PHP code when interacting with a MySQL database by using parameterized queries to prevent SQL injection attacks and by properly sanitizing user input. Additionally, they should optimize their database queries by using indexes, limiting the amount of data retrieved, and caching query results when possible. 

// Example of using parameterized queries to prevent SQL injection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->execute(['username' => $_POST['username']]);
$user = $stmt->fetch();

Keywords

SQL injection prepared statements PDO encryption input validation

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