PHP4 has been OO. PHP5 is OO, and in much better standing for OO than PHP4. PHP5 contains many of the same security in OO as Java does now (public,private,etc etc). You can use the Zend encoder to encode your PHP code, so thats not really an issue either.

I'm partial to the license provided by PHP as opposed to SUN as well.

For desktop applications though, I'd have to go with Java.

That's my two cents.