title: PHP Selectbox automatic
body: <p>Goodmorning,</p>
  
  <p>I have a question I have a selectbox with data from the database I want when u select the number out of the list the next selectbox below it fills data with something else RELATED to the first one that also contains a query from the database.</p>
  
  <p>so basically it is I select Klantvraag numbers in selectbox 1 when U select the box with number 5 the second box select Contract numbers related to that Klantvraag numbers.</p>
  
  <p>How can I achieve this?</p>