What are some common pitfalls to avoid when writing PHP scripts for form submission and data manipulation?

One common pitfall to avoid when writing PHP scripts for form submission is not properly sanitizing user input, which can leave your application vulnerable to SQL injection attacks. To prevent this, always use prepared statements and parameterized queries when interacting with a database. 

// Example of using prepared statements to prevent SQL injection

// Assuming $conn is your database connection

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

// Assuming $username and $password are the sanitized input values
$username = $_POST['username'];
$password = $_POST['password'];

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

Keywords

SQL injection XSS attacks form validation data sanitization error handling

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