Assuming today is 2/11/13. I want find 5 business days ago - so, that would be the 4th.
But using this code:
echo date("n/j/Y",strtotime("-5 weekdays"));
I get the 2/2/2013. However, when entering "-4 weekdays" I get 2/5/2013, which doesn't make sense.
Weekdays include M-F