What are some potential pitfalls of using PHP 4.3 for developing a shopping cart system?

One potential pitfall of using PHP 4.3 for developing a shopping cart system is that it lacks support for newer security features and updates, making it more vulnerable to security threats and attacks. To address this issue, it is recommended to upgrade to a newer version of PHP that includes improved security measures and patches.

// Example code snippet to upgrade PHP version
// Upgrade to PHP 7.4 or higher for better security