title: php multiple select drop down
body: <p>here is my mysql and php code layout:</p>
  
  <p>I have 3 tables</p>
  
  <ul>
  <li>tableA stores unique "person" information</li>
  <li>tableB stores unique "places" information</li>
  <li>tableC stores not unique information about a person and places they have "beenTo".</li>
  </ul>
  
  <p>here is how i layed out my form:
  -one big form to insert into "person" tableA; "beenTo" tableC
  in the form, a person mulitple selects "places" which get inserted into "beenTo"</p>
  
  <p>my question is, when i am editing a "person" how do i display what the user has already selected to appear on my multiple select options drop down menu?</p>
  
  <p>my drop down menu at the moment query "places" table and displays it in a multiple select drop down menu. its easier when a person have beenTo one place, the problem arrises when there is more than one "beenTo" places?</p>