WordPress.org

My AdSense code doesn't have a slot number

Ah, yes. Google changed the format of their AdSense code - if you're looking at some existing AdSense code and it doesn't look the same as my examples, then head back to the AdSense website and get it to create the code again.

Which version of PHP does this plugin work with?

It has been tested and been found valid from PHP 4 upwards.

Please note, however, that the minimum for WordPress is now PHP 5.2.4. Even though this plugin supports a lower version, I am not coding specifically to achieve this - therefore this minimum may change in the future.