How can a PHP developer ensure the security and efficiency of database queries in their code?

To ensure the security and efficiency of database queries in PHP code, developers should use prepared statements to prevent SQL injection attacks and optimize queries by using indexes and limiting the data retrieved. 

// Example of using prepared statements to secure database queries
$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 data validation

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