How can I detect if the user is on localhost in PHP?

Question

In other words, how can I tell if the person using my web application is on the server it resides on? If I remember correctly, PHPMyAdmin does something like this for securi

Answer 1

As a complement, as a function...

function isLocalhost($whitelist = ['127.0.0.1', '::1']) {
    return in_array($_SERVER['REMOTE_ADDR'], $whitelist);
}