What best practices should be followed when querying a database in PHP?

When querying a database in PHP, it is important to follow best practices to ensure security and efficiency. One key practice is to use prepared statements to prevent SQL injection attacks. Additionally, it is recommended to sanitize user input and validate data before executing queries. Finally, consider using PDO (PHP Data Objects) for database access as it provides a flexible and secure way to interact with different database systems. 

// Using prepared statements to query a database in PHP
$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();

Keywords

SQL injection PDO prepared statements error handling database normalization

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