What are common pitfalls to avoid when using PHP to process form submissions and send emails?

One common pitfall to avoid when using PHP to process form submissions and send emails is not properly sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To prevent this, always use prepared statements or parameterized queries when interacting with your database. 

// Example of using prepared statements to sanitize user input
$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 mail function validation error handling

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