PHPUnit版本,子PHP 5.3.3

Im running PHP Version 5.3.13.
I installed xDebug Version 2.2.6
Im also using pear.

Im trying to install and use debugging in phpStorm 8, but when I try and start a debugging session I get the following message.

Process finished with exit code 1
Cannot find PHPUnit in include path (.;C:\wamp\bin\php\php5.3.13\pear)

The big issue here is the following PHPUnit 4.4 requires PHP 5.3.3; Ive checked the versions of PHPUnit back to version 4.0 and all require PHP 5.3.3

My question is this. With my current version of PHP, I dont want to update to 5.3.3 and become a problem for our production environment, but I need to do debugging.

What can I do?
Will going from php 5.3.13 to 5.3.3 have significant effects?
Is there a lower version of PHPUnit available somewhere? (its not listed on their site or in Git)

Your case

Your version of PHP 5.3.13 is actually newer than version required (5.3.3, since 13 > 3) which means you can safely run PHPUnit 4 on your installation and enjoy it.

In general

There is no actively supported version of PHPUnit that is supported on a PHP version earlier than PHP 5.3.3.