Tag Archives: php5

Remove PHP Warning “Unable to load dynamic library” mhash after upgrading Ubuntu

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After upgrading Ubuntu to 10.04 (give or take a version), you might notice the following warning (or variant) thrown by PHP5:

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

This is the result of the latest version of PHP already having mhash included in the php5-common package.   Even though php5-mhash got removed in the upgrade, the mhash.ini file still references it (and the warning gets thrown).

To fix this, you’ll need to comment out the following line in /etc/php5/cli/conf.d/mhash.ini :

extension=mhash.so

This is a hack, but it removes the tiresome warning.

HOW TO find php.ini in Ubuntu

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Looking for the primary php.ini in Ubuntu to change some default settings across Apache?  No problemo.  Here are three different options for finding it:

  • Try running this <?php phpinfo(); ?> through your PHP interpreter.  This will show you where your main php.ini file is.
  • Or you can try searching for it in the shell:  find / -name php.ini
  • If all else fails, give it the old college try, and see if my setting works for you:  /etc/php5/apache2/php.ini (I’m on Ubuntu 9.10 – karmic).

This should just about do it for you, old chap.