Presenter handshakes to make Pfriendly Pfriends

Pfreinds.php

<?php

class Pfriend {


    private $bff="BFF";
    private $allowed=array('A','B','C'=>'C');
    private $notallowed=array('D','E','F'=>'G');

    public function makePfriend(PfriendPresenter $pfriendpresenter) {
        $that=$this; // make a local variable that is usable in a closure
        $presentables = array('allowed','bff'); // we can change this with "Logic"

          // Returns a closure with the object reference in it
        return $pfriendpresenter->acceptAccess(function($property,$default='') use ($that, $presentables) {

          if (property_exists($that,$property) && in_array($property,$presentables)) {
                // returns a scalar or a stdClass object of only public properties
                // Caller is expected to know intimately what to do with these things
              return is_scalar($that->$property) ? $that->$property : json_decode(json_encode($that->$property), true);  
          }
          return $default;
        });
    }
}


class PfriendPresenter {
  private $accessor;

  private function __construct() { }

  public function acceptAccess(Closure $accessor) {
    $this->accessor = $accessor;
    return $this;
  }

  // Need to do Presenter::forPfriend($somepfriend) to get a presenter
  public static function forPfriend(Pfriend $pfriend) {
    $pf = new PfriendPresenter();
    return $pfriend->makePfriend($pf);
  }

  public function bff() {
    $bff = call_user_func( $this->accessor, 'bff');
    return "La te da! ".$bff;
  }

  public function notallowed($default) {
    return call_user_func( $this->accessor, 'notallowed', $default);
  }

  public function allowed() {
    return call_user_func( $this->accessor, 'allowed');
  }
}

$somePfriend = new Pfriend();

$pfriendView = PfriendPresenter::forPfriend( $somePfriend );

echo $pfriendView->bff() . "\n";

echo "Not allowed: <".$pfriendView->notallowed('some default').">\n";

echo "Allowed: <".print_r((array)$pfriendView->allowed(),true).">\n";