How to add a method to an existing class in PHP?

Question

I\'m using WordPress as a CMS, and I want to extend one of its classes without having to inherit from another class; i.e. I simply want to \"add\" more methods to that class

Answer 1

An updated way for 2014 that copes with scope.

public function __call($method, $arguments) {
    return call_user_func_array(Closure::bind($this->$method, $this, get_called_class()), $arguments);
}

Eg:

class stdObject {
    public function __call($method, $arguments) {
        return call_user_func_array(Closure::bind($this->$method, $this, get_called_class()), $arguments);
    }
}

$obj = new stdObject();
$obj->test = function() {
    echo "
" . print_r($this, true) . "
";
};
$obj->test();