php call a class method from a callback parameter

Question

From Class A I want to implement a callback that includes specific methods as parameters. Eg.

    call_user_func_array($callback, ['$this->get', '$this->post']);

However this doesn't work. What I am aiming for here is to do this:

index.php

    $API = new API();
    $API->state('/users', function ($get, $post) {
        $get('/', 'UserController.getAll');
    });

API.php

    public function state ($state, $callback) {
        call_user_func_array($callback, ['$this->get', '$this->post']);
    }

    public method get ($uri, $ctrl)  { echo 'getting'; }
    public method post ($uri, $ctrl) { echo 'posting'; }

Thanks for any input! I do realize using $this->method, won't work as $this-> will not exist within the callback scope.

My PHP version is 5.5.12

andersfylling
– andersfylling

2016-01-30 18:08:10 +00:00
Commented Jan 30, 2016 at 18:08 — andersfylling
– andersfylling, Commented Jan 30, 2016 at 18:08

andersfylling · Accepted Answer · 2016-02-07 01:51:03Z

1

I found out that i somehow had to bind $this to the correct scope. I managed to do that by including $this (the class instant) with each parameter:

call_user_func_array($callback, [ [$this, 'get'] ]);

edited Feb 7, 2016 at 1:51

answered Jan 30, 2016 at 18:47

andersfylling

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Comments

ul90 · Accepted Answer · 2016-01-30 16:52:47Z

0

because you are using object methods and not global functions as callback, you must use call_user_method_array instead of call_user_func_array.

answered Jan 30, 2016 at 16:52

ul90

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5 Comments

andersfylling Over a year ago

This will give me the comment: only variables can be passed back as parameters. After reading about it i can see this is deprecated, and completely removed in php 7

Tekay37 Over a year ago

call_user_method_array is deprecated since PHP 4.1.0 and was removed with PHP 7.

ul90 Over a year ago

As i see in the php documentation, call_user_method_array is deprecated; you should use call_user_func_array(array($this, $callback), $params); now.

andersfylling Over a year ago

You should read the docs again, the first parameter should be a callable variable. not an array.

andersfylling Over a year ago

Now I feel pretty stupid, what I should have said was: "i get the error: () expects parameter 1 to be a valid callback, second array member is not a valid method"

Muhammad Saud · Accepted Answer · 2016-01-30 19:24:24Z

0

If you need access to only public members and methods then one possible solution can be this:

class API{
  public function state ($state, $callback) {
      call_user_func($callback, $this);
  }

  public function get ($uri, $ctrl)  { echo 'getting'; }
  public function post ($uri, $ctrl) { echo 'posting'; }
}

$API = new API();
$API->state('/users', function ($context) {
    $context->get('/', 'UserController.getAll');
});

answered Jan 30, 2016 at 19:24

Muhammad Saud

3504 silver badges14 bronze badges

1 Comment

andersfylling Over a year ago

If i wanted to do that, it would be easier to just add the $API into the function scope rather than including the this variable from within the class scope itself.

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