server-variables – Tarik Billa

Difference between REMOTE_HOST and REMOTE_ADDR

April 21, 2023 by Tarik

REMOTE_HOST pertains to the hostname of the client (i.e. the computer making the request). REMOTE_ADDR refers to the IP address of the client. There would be times when the hostname is unresolvable so the REMOTE_HOST will return the REMOTE_ADDR or the IP address instead.

What is the difference between HTTP_HOST and SERVER_NAME in PHP?

September 12, 2022 by Tarik

The HTTP_HOST is obtained from the HTTP request header and this is what the client actually used as “target host” of the request. The SERVER_NAME is defined in server config. Which one to use depends on what you need it for. You should now however realize that the one is a client-controlled value which may … Read more