Passing an instance method as argument in PHP

Question

I would like to create a Listener class

class Listener {
    var $listeners = array();
    
    public function add(callable $function) {
        $this->li         


        

Answer 1

Methods and properties have separate namespaces in PHP, which is why $this->bar evaluates to null: You're accessing an undefined property.

The correct way to create an array in the form of array($object, "methodName"):

Passing the callback correctly:

$listener->add(array($this, 'bar'));  

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The type hint you have given is okay—as of PHP 5.4, that is.