What are the potential pitfalls of modifying a download script in PHP, especially when adding new form fields like last name?

When modifying a download script in PHP to add new form fields like last name, potential pitfalls include introducing errors in the script logic, causing unexpected behavior, and compromising security if input validation is not properly implemented. To solve this issue, ensure that the new form fields are properly sanitized and validated to prevent any malicious input. 

// Example of adding last name field to a download script
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $first_name = $_POST['first_name'];
    $last_name = $_POST['last_name'];

    // Validate input
    if (empty($first_name) || empty($last_name)) {
        echo "Please fill out all fields";
    } else {
        // Process download logic here
    }
}

Keywords

download script PHP form fields last name modification

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