The Problem

Chances are you have seen the following error message (or else you would probably not have found this post):

Error: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/suhosin.so' -
/usr/lib/php5/20100525/suhosin.so: cannot open shared object file: No such file or directory in Unknown, line 0

I hope I am not the only one who lived with this message for a while, because everything was working as expected. But even though I never noticed any real problem, the message surely gets on your nerve after a while, so it’s time to make it go away…

The Solution

The solution is actually very easy. As mentioned on the Debian Bug Tracking System ages ago, all you need to do is to purge the suhosin package (the php5-suhosin package, to be precise):

sudo aptitude purge php5-suhosin

(In case you have not enabled sudo, just do the usual and run this command as superuser without the sudo.)