What are some common pitfalls when using PHP to handle form data submission?

One common pitfall when handling form data submission in PHP is not properly sanitizing user input, leaving the application vulnerable to SQL injection attacks. To solve this issue, always use prepared statements or parameterized queries when interacting with a database to prevent malicious input from being executed as SQL code. 

// Example of using prepared statements to handle form data submission securely

// Assuming $conn is the database connection object

$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $email);

$username = $_POST['username'];
$email = $_POST['email'];

$stmt->execute();
$stmt->close();

$conn->close();

Keywords

SQL injection cross-site scripting form validation CSRF protection error handling

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