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).