React PHP Get Method Imitation

Description:

This is a simple React component that displays a form allowing the user to submit input. If there is a ui query parameter in the URL, it will display an alert with its value when the component is rendered.

Usage:

1. Enter a value in the "User Input" text field.
2. Submit the form.
3. If the URL contains a query parameter ?ui=<value>, an alert will show the value of ui.