Visitors to the official website for the PHP programming language over the past couple of days might have had their computers infected with malware. Hackers managed to inject malicious JavaScript code into a file on the php.net site called userprefs.js. The code made requests to a third-party website that scanned visitors' browsers for vulnerable plug-ins and executed exploits that, if successful, installed a piece of malware, said Daniel Peck, a research scientist at Barracuda Networks.