I want to be able to do the following:

PHP Code:
$this->recordClassName 'Blah';
return new 
$this->recordClassName($this,$this->data); 
I was rather hoping that doing the above would be the equivalent of saying:

PHP Code:
return new Blah($this,$this->data); 
But it returns the following error:
Code:
Fatal error:  Class name must be a valid object or a string in [redacted]
How do I get PHP to recognise recordClassName as a string?