Additions to the PEAR conventions:

  **********
  inclusion:
  **********
  
  global parameters:
  
  $myEnv[module] = "contact";
  $myEnv[output] = "html";
  
  include('MGW_vCard.php');

(export classes and functions that are to be reused in another context to a separate class of file).

  ********
  control:
  ********
  
  if (isset($dump)){
  dumpVCard($id, $PHPSESSID);
  } else {
  exportVCard($id, $PHPSESSID);
  }

(which will be more complex in other modules, but shows at the beginning of the page what functions to expect)

  ***************
  implementation:
  ***************
  
  function exportVCard($id, $PHPSESSID){
  ...}
  function dumpVCard($id, $PHPSESSID){
  ...}

Clearly defined interfaces what parameters we need to make the function work and to improve testing of single methods).