如何通过PHP中的变量引用选择对象的子对象？

I have an object in PHP (in my case, a CakePHP model), that has child objects, eg. the structure of $this->Model1->Model2.

I am aware that the above syntax is the correct way to reference the object, but if I have obtained the name of Model2 via another process, so it is a string variable. How can I reference it using this variable, similar to as follows:

$model_name = 'Model2';
$this->Model1[ $model_name ]->run_function();

Now clearly this array-style of selecting the object/class doesn't work, but is there a similar method I should be using? Or is there better coding practice that wouldn't result in this issue all together?

Are you looking for this?

$property = 'myProperty';
$object->{$property};

Just do like this:

$this->Model1->$model_name->run_function();