title: PHP drop down which each are dependable
body: <p>I have this problems. using html and php. </p>
  
  <p>May I know how to do this. I have 2 drop down, eg A and B. Drop down B is depend to the drop down A. Example, A have these options which will be called from dbase(no prob with this, tq) (Jack, Carol), and B wil have options depend on A: if select Jack(T1, T2, T3), if select carol(T1,T2,T3,T4,T5).</p>
  
  <p>Here are the sample interface. </p>
  
  <p><a href="https://i.stack.imgur.com/CFVkS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CFVkS.png" alt="alt text"></a>
  </p>
  
  <p>Can someone help me with this?</p>
  
  <p>thank you.</p>