How To Create An Object From A Class Name Which Is A String?

I am trying to create objects based on the key value of an array.

foreach($vars as $key => $value) {
$vars[$key] = new ${$key}(); // line 56 of myfile.php
}

But I got following errors. I know that it's defined, I suspect that php think that I want to do something else...

Undefined variable: id in myfile.php on line 56
PHP Fatal error: Class name must be a valid object or a string in myfile.php on line 56

id is value of the $key. How should I do it?



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