What are the best practices for handling form submissions and variables in PHP?

When handling form submissions in PHP, it is important to properly sanitize and validate user input to prevent security vulnerabilities such as SQL injection and cross-site scripting. Additionally, it is recommended to use prepared statements when interacting with a database to prevent SQL injection attacks. Lastly, always use secure methods to store sensitive data such as passwords, such as hashing and salting. 

// Example of handling form submission and variables in PHP

// Sanitize and validate user input
$username = filter_var($_POST['username'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);

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

// Securely store sensitive data
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

Keywords

form submissions variables PHP security validation

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