How do I generate numbers in php that display (for example) Lead Number...

To picture this...
It'look like this (phone numbers are random):

Lead #       Name         Phone
1            Bob          911
2            Jack         119
3            Joey         191
4            Ashley       9110
5            Michael      0119

So how do I create that column on the left that auto numbers each inquiry?

Thanks!

Figured it out by using this:

                        $count= count(file("CSVFILENAME.csv"));