It is not Apache-specific like mod_perl though. PHP3 runs natively under
Windows as well now, and has both NSAPI and ISAPI support. There will
even be Unix-based ISAPI support to go along with the ISAPI-capable Zeus
server.
mod_perl is a very handy. I use it myself quite a bit. But there are a
lot of shortcomings, not the least of which being the Perl language itself
which can be extremely daunting to a non-programmer.
PHP is evolving. PHP3 is not completely backward compatible with PHP2 and
earlier. If I am going to make the jump to a full XML parser, then now is
probably a good time to do it. However, given the target audience of PHP,
forcing people to think in XML terms might be quite a stretch.
-Rasmus