What best practices should be followed when handling form submissions and database interactions in PHP?

When handling form submissions and database interactions in PHP, it is important to sanitize user input to prevent SQL injection attacks and validate the data before inserting it into the database. Additionally, using prepared statements with parameterized queries can help prevent SQL injection vulnerabilities. Lastly, always remember to handle errors gracefully and securely store database credentials. 

// Sanitize user input
$name = filter_var($_POST['name'], FILTER_SANITIZE_STRING);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Validate data
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    die("Invalid email address");
}

// Connect to database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare and execute SQL query using prepared statements
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();

Keywords

SQL injection prepared statements PDO form validation data sanitization

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