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What are common errors to look out for when registering users in PHP?

One common error when registering users in PHP is not properly validating user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always sanitize and validate user input before inserting it into the database.

php 
// Sanitize and validate user input before inserting into the database
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

// Insert sanitized input into the database
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':email', $email);
$stmt->execute();

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