Mediawiki plugin doesn't work in 1.15.2 and PHP 5.3

What steps will reproduce the problem?
1. Enable ReCAPTCHA
2. Edit a page

What is the expected output? What do you see instead?

Backtrace instead of a wiki page offering a recaptcha

What version of the product are you using? On what operating system?

MediaWiki 1.15.2

Please provide any additional information below.

Original issue reported on code.google.com by stephen....@gmail.com on 5 Oct 2010 at 8:51

thiagocavaloti / recaptcha

Mediawiki plugin doesn't work in 1.15.2 and PHP 5.3 #85