How can PHP developers ensure efficient and effective usage of database queries within their code?

To ensure efficient and effective usage of database queries in PHP code, developers should minimize the number of queries executed, use prepared statements to prevent SQL injection, and optimize queries by indexing tables and using appropriate joins. 

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

Keywords

SQL injection prepared statements indexing query optimization database normalization

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