Just for the case somebody needs it also:

Assuming the file is in folder std/cod2.gsc

PHP Code:
// cod4 interoperatiliby
// include if needed: #include std\cod2;
getcvar(name) { return getdvar(name); }
getcvarfloat(name) { return getdvarfloat(name); }
getcvarint(name) { return getdvarint(name); }
setcvar(namevalue) { return setdvar(namevalue); }
setclientcvar(namevalue) { return self setclientdvar(namevalue); }