See my blog article here: http://blog.flowl.info/2013/php-container-class-anonymous-function-lambda-support/
You need to add a magic __call
function:
public function __call($func, $args) {
return call_user_func($this->$func, $args);
}
The problem is that within this construct you can call private methods from public scope.
I suggest not to simply add new variables to a class that are not defined. You can avoid this using magic __set
functions and catch all undefined variables in a container (= array, like in my blog post) and change the call_user_func behaviour to call only inside the array:
// inside class:
public $members = array();
public function __call($func, $args) {
// note the difference of calling only inside members:
return call_user_func($this->members[$func], $args);
}