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I'm trying to revive an old project of mine. It was built with phalconphp 2 or 3 (I don't even remember which version, but quite old). There, I could include a call to the loop inside the controller, so a different controller action's output could be embedded into the output, just by calling

$this->app->request(['controller' => 'OtherController', 'action' => 'action', 'params' => []])

But now using Phalcon 5, this doesn't work anymore ("Access to undefined property app"), and I couldn't find anything about this in the docs.
How can I make it work?

What I have tried:

I tried to use $this->dispatcher, but got an infinite loop. So it doesn't work.
Updated 28-Aug-23 10:23am

The error message is telling you that there is no variable named app defined anywhere. So you need to look at the rest of your code to find out why.
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You need to use the appropriate 'use' statement at the top of your controller in Phalcon 5 -
use Phalcon\Mvc\Dispatcher;

Inside your controller action, you can use the Dispatcher to forward the request to another controller's action and capture its output, your code will be something like the following, similar but with changes from the older Phalcon versions -
use Phalcon\Mvc\Dispatcher;

public function yourAction()
    //Get the dispatcher instance...
    $dispatcher = new Dispatcher();

    //Forward your request to a different controller's action...
    $forwardedResponse = $dispatcher->forward([
        'controller' => 'OtherController',
        'action' => 'otherAction', //Change this to your newly needed action...
        'params' => [] //You can pass parameters here as needed...

    //Get the output...
    $embeddedOutput = $forwardedResponse->getContent();

    //Your current action logic here...
    //Now you can use $embeddedOutput where it is needed...    
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