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I'd like a lightweight way to figure out what is invoking a certain action in an effort to provide logic for certain scenarios where I can't help to avoid a function invocation (for example, a new comment firing edit_post). Is there a way to figure out which action/filter invoked a function?

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Sure, just use current_filter().

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That tells me the current action/filter, which is the only information I know of. I'm trying to figure out where that action was invoked. For example, edit_post is called in both wp-includes/comment.php and wp-includes/post.php and I'd like to be able to tell the difference. – editor Aug 3 '11 at 15:54
In that case, you have to dig through the stacktrace returned by debug_backtrace(). Or hook your callback from a second callback that itself is hooked into an earlier action that's specific to wp-includes/comment.php or wp-includes/post.php. – scribu Aug 3 '11 at 15:55
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Or you could use did_action(), passing an action that only fires on wp-includes/comment.php, for example. – scribu Aug 3 '11 at 16:01
Good ideas, thanks scribu – editor Aug 3 '11 at 17:36

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