Checking if a property exists in class

[knickerlas]

Hi
I need to find out if a property exists in a class. I need to check this in a function within the class.

Example

class something {

var $one="one";
var $two="two";

function test($var) {
return $this->$var;
}
}

I don't want to define seperate functions for each var as the real functions in my class are far more complex than the example.

Cheers

Nick