How can variables be effectively sanitized before being inserted into SQL queries to prevent SQL injection attacks in PHP?

To prevent SQL injection attacks in PHP, variables should be sanitized before being inserted into SQL queries. This can be done by using prepared statements or parameterized queries, which separate the SQL query logic from the user input. This ensures that user input is treated as data rather than executable code, effectively preventing SQL injection attacks. 

// Example of using prepared statements to prevent SQL injection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $_POST['username']);
$stmt->execute();

// Fetch and process the results

Keywords

SQL injection Sanitization Prepared statements PDO Escaping

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