You can simply google the answer yourself. And you should really start googling. You are asking VERY basic questions all the time (even tho they already have been answered!).
One helpful answer has been given in your older thread: https://bitcointalksearch.org/topic/m.40079188
I wonder why you actually created this thread if you already know everything you should about this command, especially since you already have asked about it in your previous thread..
Because I found that sometimes multiple same confirmations tx ids come into notification files that generated when custom php file being called.
And sometimes that tx id comes when its confirmations become over 100 or 300, so later time from confs 0 or 1.