Suhosin goes further than that however in allowing the attack surface that PHP adds to a Web Server to be reduced to the users needs through function whitelists and various other easily enabled protections. This may reduce the risk of deploying previously deemed unsafe PHP programs to an acceptable level.
It is also activated by default in Mac OS X Server.
As of PHP 5.4, openSUSE has dropped Suhosin patch from the code, but maintains a port of the suhosin extension with own patches.
As of 2013 when PHP 5.5 released, the most current Suhosin version is targeted at PHP 5.3.9. The last news article on the website is of 2007 and the code repository has last seen activity in 2012  which leads some distributions to consider Suhosin project dead.
- Chapter 13, Securing PHP Web Applications by Tricia Ballad; William Ballad Publisher: Addison-Wesley Professional, Web ISBN 978-0-321-57431-2
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