Php Fatal Error in 2.5.15

From Joomla! Documentation

The "J2.5" namespace is a namespace scheduled to be archived. This page contains information for a Joomla! version which is no longer supported. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.

A fatal error has been found in Joomla 2.5.15, when used with PHP 5.2.

Versions affected

Info non-talk.png
General Information

This pertains only to Joomla! version(s):- 2.5.15

What is the cause

A non-PHP 5.2 compatible function was used in the JHttp class.

How to fix

Please update to 2.5.16