Suggestions for improving collection of related PHP functions?
Just an idea, but maybe this will help you from a manageability point of view:

 public function process($command, $parameters) {
      $method = 'MinteCommand_' . $command; 
      $methodFile = dirname(__FILE__) . 'commands/' . $method . ".php";
      if (file_exists($methodFile)) {
            require_once($methodFile);
            if (function_exists($method)) { 
                 return $method($parameters);  
            } else { 
                 throw "invalid function";
            }
      } else {
            throw "invalid function file";
      }
 }


The only benefit to this is that you simply create a new file with the new command (function) inside of that file and it'll automatically search for it if the command is issued.  One caveat will be the limit on the number of commands you can have is a limit on the number of files you can have in a single directory on the filesystem...

Note The code may not be perfect from a syntax point of view.  It's just to give you the general idea / concept.