php - Is $_SERVER['REMOTE_ADDR'] always isset()?

Question

I want to store ip2logn($_SERVER['REMOTE_ADDR']) values in the db for some reason.

Practically, as I see, $_SERVER['REMOTE_ADDR'] always has a value. Could anybody confirm it is always set for any user and can't be not set by any reason?

The reason I ask it is to be sure I should choose NOT NULL instead of DEFAULT NULL for the column in MySQL Table.

So, I can store ipaddressvarchar(15) NOT NULL (yes, NOT null) or ip2longaddress int(11) NOT NULL, and the second option is, as I understand, the most preferable.

Thank you.

Answer 1

It will only be set if you're running the script through a webserver. If you're running PHP in CLI (command line) mode, REMOTE_ADDR will not be set, as there is no remote address for a command line script.