not get response from call a user function

[aabhishek04]

I'am not getting response from user define methods . is there any way to get response to hit user method and get response...

<?php

use Amp\Parallel\Worker; use Amp\Promise;

class TestController {

public function getSum($a,$b){
    return $a+$b;
}
public function getDivsion($a,$b){
    return $a/$b;
}
public function getMultipel($a,$b){
    return $a*$b;
}

public function algoExecution()
{ 

    $funs = [
        $this->getSum(2,2),
        $this->getDivsion(2,2),
        $this->getMultipel(2,2)
    ];

    $promises = [];
    foreach ($funs as $fun) {
            $promises[] = Worker\enqueueCallable('call_user_func',$fun);
    }

    $responses = Promise\wait(Promise\all($promises));

    foreach ($responses as $key => $response) {
        \printf($response, $key);
    }

}

}