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What are some best practices for ensuring PHP script security, especially when handling user inputs and database queries?

One best practice for ensuring PHP script security when handling user inputs and database queries is to use parameterized queries to prevent SQL injection attacks. This involves using prepared statements with placeholders for dynamic data, which are then bound to the actual values before execution. Example PHP code snippet using parameterized queries:

php 
// Establish database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a statement with a placeholder for user input
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the actual value to the placeholder
$stmt->bindParam(':username', $_POST['username']);

// Execute the query
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

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