why no create_method ?

Is there anyway to create a class method, I want to return an object which has a number of 'runtime' methods. What I want to do is parse a WSDL and generate an interface object ( with the correct functions ), the way I see it I cant do this as we lack a create_method call. I can parse the WSDL and build a class, but I then have to require the class. I dont want to do that though as its more of a static language way of doing things. The closest Ive come is this.... class base_obj { }; $o = new base_obj; $o->method_1 = create_function( '$str', 'echo( $str );' ); unfortunatly you cant call $o->method_1( "hello world" ); you have to do $tmp = $o->method_1; $tmp( "hello world" ); Am I missing something or is it imposible to do what I want. Rich