See reportings in http://forum.piwik.org/read.php?2,78979

When clicking on Security Tab in Settings Fatal error: Class 'Piwik_Http' not found in /home/piwik/public_html/plugins/SecurityInfo/PhpSecInfo/Test/Application/php.php on line 34

The class 'Piwik_Http' that class 'PhpSecInfo_Test_Application_Php' is trying to use doesnt appear to be loaded.

By adding class 'Piwik_Http' to '/plugins/SecurityInfo/PhpSecInfo/Test/Application/php.php' allows the method 'PhpSecInfo_Test_Application_Php' to use the class and then the Security Page page works.

Adding the following code before trying to use the class fixes the issue as a temporary solution:

if (!class_exists('Piwik_Http', false))
{
include(PIWIK_INCLUDE_PATH .'/core/Http.php');
}

Patch attached

I think some sort of check for dependent classes should be introduced and should fail during automated tests.

PHP 5.3 Piwik 1.5.1

Keywords: class extends doesnt exist