Here is the result of tracking following functions,
add_action
add_filter
apply_filters
do_action
Due to size and table format concern, please visit http://www.laobanit.com/to-share/log001.php directly
to see this result.
The output is based on I hit Sample Page of my testing envrionment at local computer, you can verify this by checking
----------------
413
apply_filters
option_siteurl http://localhost:8080/blog/test2
----------------
All arrays have been converted to readable nested html table, however all objects are in plain text.
Hope this result can help you to understand more of WordPress in depth. It enlightens me a lot.