Spam users are injecting bad content linking to phpkode.com.
From a cursory search for "PHPKode":
- Exhibit A
- Exhibit B (Posing as a question, "PHP Framework" Massive Google bombing attempt)
- Exhibit C (both contributions by this user point to PHPKode)
- Exhibit D
- Exhibit E (Google-Bomb fake question, again)
- Exhibit F fake question on Serverfault
This behaviour does not seem to be limited to Stack Overflow. Usenet example
I say this calls for a link blacklisting.