What are the best practices for securely handling user input in PHP forms to prevent vulnerabilities?

When handling user input in PHP forms, it is crucial to sanitize and validate the input to prevent vulnerabilities such as SQL injection and XSS attacks. One way to achieve this is by using PHP's filter_input function along with filter_var to sanitize and validate user input. 

// Sanitize and validate user input
$username = filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING);
$email = filter_input(INPUT_POST, 'email', FILTER_VALIDATE_EMAIL);

// Use prepared statements for database queries
$stmt = $pdo->prepare("INSERT INTO users (username, email) VALUES (:username, :email)");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection cross-site scripting htmlentities prepared statements validation

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