How can PHP beginners avoid common pitfalls like using outdated functions such as addslashes() in their scripts?

Using outdated functions like addslashes() can lead to security vulnerabilities in your PHP scripts. To avoid this, beginners should use modern functions like prepared statements with parameterized queries to prevent SQL injection attacks. Prepared statements separate SQL logic from data input, ensuring that user input is properly sanitized before being executed as a query. 

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

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PHP beginners outdated functions addslashes() scripts

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