How can PHP developers secure their applications against SQL injection attacks that exploit User-Agent and Referer headers?

SQL injection attacks that exploit User-Agent and Referer headers can be prevented by properly sanitizing and validating input data before using it in SQL queries. PHP developers can secure their applications by using prepared statements with parameterized queries to prevent malicious SQL injection attempts. 

// Example code snippet to prevent SQL injection using prepared statements
$pdo = new PDO('mysql:host=localhost;dbname=mydb', 'username', 'password');
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();
$results = $stmt->fetchAll();

Keywords

SQL injection PHP security User-Agent header Referer header protection techniques

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