Machine-readable PHP documentation?

I maintain a PHP IDE, and scrape php.net's documentation periodically for information on built-in functions, classes, constants, etc. using regular expressions. The problem is, the actual HTML syntax changes periodically. Is there any way for me to access the source data that is used to produce those manual pages? My results would be better, my development time would go down, and it would save php.net a crawl's worth of bandwidth weekly. Thanks! Ben Dilts