Question

Consider the following code, which is a scheme of storing a callback function as a member, and then using it:

class MyClass {
  function __construct($callback) {
    $this->callback = $callback;
  }

  function makeCall() {
    return $this->callback();
  }
}

function myFunc() {
  return 'myFunc was here';
}

$o = new MyClass(myFunc);
echo $o->makeCall();

I would expect myFunc was here to be echoed, but instead I get:

Call to undefined method MyClass::callback()

Can anyone explain what’s wrong here, and what I can do in order to get the desired behaviour?

In case it matters, I am using PHP 5.3.13.

Answer 1

You can change your makeCall method to this:

function makeCall() {
  $func = $this->callback; 
  return $func();
}