Certainly! Here’s an example of a PHP code that allows you to store centuries as a text file:

“`php

Store Centuries

“`

This code creates a simple HTML form where you can enter a century. When the form is submitted, the PHP code will open the specified file in append mode, write the century to a new line in the file, and then close it. The entered centuries will be stored in the "centuries.txt" file (or you can modify the file path as needed).

Please note that this is a basic example and doesn’t include robust error handling or security measures. In a real-world scenario, you should consider additional precautions like validating user input, protecting against malicious data, and securing the file storage.