title: How to pass APEX parameter values to external URL
body: <p>In my APEX application I have created a button that should carry a parameter value of the current page to an external URL</p>
  
  <p>The optional URL redirect target is set to URL of PHP file.</p>
  
  <p>I have set the URL target for the button to <a href="http://[URLNAME]?sid=:student" rel="nofollow">http://[URLNAME]?sid=:student</a></p>
  
  <p>From what I understand the APEX variable is not substituted.</p>
  
  <p>Can anyone tell me how it CAN be substituted ?</p>
  
  <p>Many thanks</p>