Using $this in method called with call_user_func_array

Question

I have a method, which simplified looks like this:

class Foo {

   public function bar($id) {
      // do stuff using $this, error occurs here
   }

}

Calling it like this works great:

$foo = new Foo();
$foo->bar(1);

However, if I call it using call_user_func_array(), like this:

call_user_func_array(array("Foo", "bar"), array('id' => 1));

Which should be equal, I get the following error:

Fatal error: Using $this when not in object context in

($this is undefined)

Why is this? Is there something I am missing? How should I do this so I still can use $this in the called method?

Answer 1

array("Foo", "bar") is equal to Foo::bar(), i.e. a static method - this makes sense since $foo is nowhere used and thus PHP cannot know which instance to use.

What you want is array($foo, "bar") to call the instance method.

See http://php.net/manual/en/language.types.callable.php for a list of the various callables.

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You also need to pass the arguments as an indexed array instead of an associative array, i.e. array(1) instead of array('id' => 1)