PHP Fatal error: Allowed Memory Size of 20971520 Bytes exhausted (tried to allocate 131072 bytes) Error and Solution




I've brand new Ubuntu Linux server (Apache + PHP5 FastCGI + Lighttpd image only server) installed for my wordpress, mediawiki and vBullietin software. I can load forntpage of all software but user cannot edit any wiki pages or post anything and I get the following error in log file:
PHP Fatal error: Allowed Memory Size of 20971520 Bytes exhausted (tried to allocate 131072 bytes) in /usr/share/mediawiki/includes/OutputHandler.php on line 81
How do I fix this problem?

Ubuntu / Debian PHP5 comes with 16MB php memory limit. Edit /etc/php5/cgi/php.ini and /etc/php5/cli/php.ini files, run:
sudo vi /etc/php5/cgi/php.ini
sudo vi /etc/php5/cli/php.ini

Set maximum amount of memory (e.g., 128M) a script may consume:
 
memory_limit = 128M
 
Save and close the file. However, real enforcer is suhosin security patch applied to PHP5. Edit /etc/php5/conf.d/suhosin.ini, run:
sudo vi /etc/php5/conf.d/suhosin.ini
Set allowed memory size (128M):
suhosin.memory_limit = 128
Save and close the file. Note if /etc/php5/conf.d/suhosin.ini file not found, type the following command to install the same, enter:
sudo apt-get install php5-suhosin
Finally, restart the web server:
sudo /etc/init.d/apache2 restart
OR
sudo /etc/init.d/lighttpd restart

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