HTML PHP get select value in same page : <p>I have a question about HTML select form.</p>

<p>I have 5 select forms something like following picture.
<a href="https://i.stack.imgur.com/uNHHB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uNHHB.png" alt="pic 1"></a></p>

<p>You have to select from the first select form, and then the second select form will display the lists by value select from the previous select form.</p>

<p>The lists are getting from MYSQL.</p>

<p>How should I perform above function?</p>
