What best practices should be followed when handling form data in PHP?

When handling form data in PHP, it is important to validate and sanitize the input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. Additionally, it is recommended to use prepared statements when interacting with a database to prevent SQL injection. Finally, always use the POST method to submit form data instead of GET to keep sensitive information out of the URL. 

// Example of validating and sanitizing form data in PHP
$name = isset($_POST['name']) ? htmlspecialchars(trim($_POST['name'])) : '';
$email = isset($_POST['email']) ? filter_var(trim($_POST['email']), FILTER_VALIDATE_EMAIL) : '';
$password = isset($_POST['password']) ? trim($_POST['password']) : '';

// Example of using prepared statements to interact with a database
$stmt = $pdo->prepare("INSERT INTO users (name, email, password) VALUES (:name, :email, :password)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->bindParam(':password', $password);
$stmt->execute();

Keywords

validation sanitization security htmlspecialchars filter_input

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