As the description states, this is simply the standard php4-pspell currently available in Debian Unstable, but backported to Sarge.

The source package from Unstable builds that packages php4-pspell and php5-pspell, as Sarge does not include PHP5, I have decided not to include this, I figure if you have installed PHP5 you are either running unstable already or you have the know-how to do this yourself.

If anyone out there would like the PHP5 module build, please let me know and I will see what I can do...

I currently use this package with Emil's Excelent LiteSpellChecker.