I'm writing some web service for Elgg in PHP. I use xdebug for debugging.

The issue is:

I can jump into any function in the current .php. But when I jump into other function of elgg like

$user = get_user_by_username($username);

then it stops immediately, so I can not debug anymore.

I've tested with both Eclipse and Netbean, it still has the same probleum.

Someone could tell me the solution,please.