php pipe interface for Aspell

I'm looking for a php class I can use to access Aspell's pipe interface.

In my application I need to pass a complete HTML document to Aspell in 
sgml mode.

I have been experimenting with a class written by Andreas Gohr.
http://dev.splitbrain.org/reference/dokuwiki/inc/aspell.php.source.txt

This class works perfectly with some HTML documents but with others it 
completely locks up (hangs). I think (not sure) the problem is either in 
method runAspell() or execPipe() but my experience with pipes/streams is 
not sufficient to work out exactly what is going wrong.

Has anyone used Andreas Gohr's php class and come across this problem?

Can anyone suggest an alternative php class pipe interface for Aspell 
that is suitable for checking complete HTML documents?

Thanks for any advice

Cheers
Seth