How can PHP developers ensure that their database queries are secure and optimized?

To ensure that database queries are secure and optimized, PHP developers should use parameterized queries to prevent SQL injection attacks and properly index their database tables for faster query performance. 

// Example of using parameterized queries with PDO
$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();
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO parameterized queries indexing

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