CakePHP: best way to call an action of another controller with array as parameter?

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I would not advice to use the method requestAction but rather import, and instantiate the needed controller.

CakePHP doc says about requestAction that:

“It is rarely appropriate to use in a
controller or model”

http://book.cakephp.org/view/434/requestAction

Once you imported and loaded the controller you can call any method of this controller with its parameters.

<?php
  //Import controller
  App::import('Controller', 'Posts');

  class CommentsController extends AppController {
    //Instantiation
    $Posts = new PostsController;
    //Load model, components...
    $Posts->constructClasses();

    function index($passArray = array(1,2,3)) {
      //Call a method from PostsController with parameter
      $Posts->doSomething($passArray);
    }
  }
?>

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