Make comment truncation optional in json_parse

Hi there,

I encountered an interesting issue today while working with an API. In some of its strings, it basically had some CSS from Word or a Word-like program. Long story short, I found that the preg_replace in extras/jsonrpc/jsonrpc.inc:json_parse was truncating the whole string because of that! Obviously, the regexes need a bit of work to only remove the comment. I can see, for example, that the backreferences don't look right.

Truth be told, though, I don't need that functionality at all for the data I am retrieving, so I patched it to allow turning off the functionality. Since that's an optimization point, maybe this will also slightly improve the performance. In any case, it stopped json[_alt]_decode from erroring out on syntax - the syntax error being an empty string, of course.

Thought I would submit a patch in case this throws out anyone else. It is probably not implemented in the best possible way because I haven't had the time to review all the code or learn its patterns; however, at first glance it seems to more or less follow the same code conventions as similar functions. For example, I simply pass the $options array to json_parae and then check for a particular key. Actually, json_extension_api.inc:json_decode also needs an $options parameter ($options = array())...but that is easy to add, doesn't really need a patch.

Thanks for creating this library. The default PHP 5.2 json_decode, at least on my testing system, will only let me parse a handful of records, meaning I'd have to page like crazy. This one can handle all 200, even if it takes a few seconds :) - and it's probably the most portable. I could have gone with PEAR, but then I'd have to get all my users to install the Services_JSON package...better to just be able to bundle things...

Regards,
Kevin