This graph is produced by KCacheGrind from a backtrace file produced by XDebug (http://xdebug.org/). The combination of these tools is very valuable in identifying performance problems in PHP applications. Not at this level of detail, though :)
This might also be used as an educational tool for exploring the intricacies of the Zend FW.
Especially those parts in which the Zend handles the 'View' and 'Controller' of the MVC :)
This comes across as totally meaningless. Even ignoring the fact that this corresponds to no real world use of ZF there is way too much detail here for it to be useful.
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[ 2.3 ms ] story [ 38.7 ms ] threadhttp://www.gnegg.ch/2006/08/profiling-php-with-xdebug-and-kc...
And if you don't bother installing KDE3 on your Mac, there's also
http://www.maccallgrind.com/
and
http://ccg.wiki.sourceforge.net/
and
http://code.google.com/p/webgrind/
All three tools parse the profiling Output that's generated by XDebug which runs perfectly well on a mac, or on any machine PHP runs on.
For a comparison to other PHP applications see this post: http://blog.fedecarg.com/2008/08/04/php-applications-where-i...