title: Filling Dropdowns From Web-Service SOAP Response
body: <p>Using PHP, I am working to create a series of dropdown menus that work in a sequential order while populating via numerous web-service calls. </p>
  
  <p>For example, a user will select a year from dropdown #1. With that year, I then make a SOAP call (using only the given year) to gather makes and populate dropdown #2. This will then make another SOAP call (using the given year and make) to gather models. This will then make another SOAP call (using the given year, make, and model) to gather an id. A final SOAP call will then be made using the given ID to get the desired data.</p>
  
  <p>My question, how can I go about accomplishing this with so many calls and "holding" all the needed values throughout the process?</p>