Cute : these days on 7search the most common searches containing php are openx-ad urls and blocked domain urls.
It seems losely connected to a bh-campaign on facebook installing WinPC Anti-Virus. A lot of it comes from referals to aportals.net and canfind.com containing the same error.
A typo in the openX ad campaign I think, HTTP:/ missing one forward slash, causing the browser to dump the url to Google Search. Which then redirects to the WikiPedia definition of HTTP :).