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How to get rid of “PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib/php5/20090626/suhosin.so'” on Debian GNU / Linux

Tuesday, October 25th, 2011

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After a recent new Debian Squeeze Apache+PHP server install and moving a website from another server host running on CentOS 5.7 Linux server, some of the PHP scripts running via crontab started displaying the following annoying PHP Warnings :

debian:~# php /home/website/www/cron/update.php

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php5/20090626/suhosin.so' – /usr/lib/php5/20090626/suhosin.so: cannot open shared object file: No such file or directory in Unknown on line 0

Obviously the error revealed that PHP cli is not happy that, I've previously removes the suhosin php5-suhosin module from the system.
I wouldn't have removed php5-suhosin if sometimes it doesn't produced some odd experiences with the Apache webserver.
To fix the PHP Warning, I used first grep to see, where exactly the suhosin module gets included in debian's php.ini config files. debian:~# cd /etc/php5
debian:/etc/php5# grep -rli suhosin *
apache2/conf.d/suhosin.ini
cgi/conf.d/suhosin.ini
cli/conf.d/suhosin.ini
conf.d/suhosin.ini

Yeah that's right Debian has three php.ini php config files. One for the php cli/usr/bin/php, another for the Apache webserver loaded php library/usr/lib/apache2/modules/libphp5.so and one for Apache's cgi module/usr/lib/apache2/modules/mod_fcgid.so .

I was too lazy to edit all the above found declarations trying to include the suhosin module in PHP, hence I remembered that probably all this obsolete suhosin module declaration are still present because probably the php5-suhosin package is still not purged from the system.

A quick check with dpkg , further strenthened my assumption as the php5-suhosin module was still hanging around as an (rc – remove candidate);

debian:~# dpkg -l |grep -i suhosin
rc php5-suhosin 0.9.32.1-1 advanced protection module for php5

Hence to remove the obsolete package config and directories completely out of the system and hence solve the PHP Warning I used dpkg –purge, like so:

debian:~# dpkg --purge php5-suhosin
(Reading database ... 76048 files and directories currently installed.)
Removing php5-suhosin ...
Purging configuration files for php5-suhosin ...
Processing triggers for libapache2-mod-php5 ...
Reloading web server config: apache2.

Further on to make sure the PHP Warning is solved I did the cron php script another go and it produced no longer errors:

debian:~# php /home/website/www/cron/update.php
debian:~#