Hello, I made a patch to add PHP profiling support to the PHP language.
It adds 'set_profile_handler' and 'restore_profile_handler' that work
similar to the 'set_error_handler' and 'restore_error_handler' functions
and are the minimum needed to allow people to profile their PHP code
directly from PHP. The rationale behind adding support to the PHP
language for this rather than doing it behind the scenes with C modules
is to give people a lot of flexibility over the profiling of their
applications and the resulting data. It makes it really easy to do
things like save the result to your application's database, profile only
on certain conditions and/or for certain users, and lets you easily
display the profiling report on the same page that was profiled for
example, which saves developers from having to cross-reference profiling
logs all the time.
The patch, an example profiler that uses it written in PHP, and some
example screenshots of that are at:
http://www-cse.ucsd.edu/~sbrown/profiler/php-profiler.html
The patch is against 4.2.1 and 4.1.2, but is clean on 4.2.2 and surely
many other versions.
I wasn't sure how PHP's symbol table is affected by function calls, so I
strduped the function name and file name across the function call to
make sure nothing bad would happen to them. While it works fine, that
information is probably preserved somewhere already so the strdups could
be removed.
