If you read the key elements it only affects Windows:
"When it executes, PHP.NewWorld looks for php, hm, html or htt suffix files in the C:Windows directory. All files found with these extensions will become infected."
"When a user executes a dot.php file, Central Command says, the virus body will be executed from an external file and will take full control."
Usually when a warning states that the virus is going take full control or wipe your hard disk, or all files will become infected it is a hoax.
Also the whole article seems a bit weak on details. The article states that the problem is on the server and makes no mention of propogating through to a client. When running anything on Windows you should be cautious of running any new code of unknown origin.
have a database of most known viruses and hoaxes, yet they haven't got anything related to php.newworld yet.
I know I haven't answered the question but hopefully given you some useful info.