How to create an authorization for individual pages?

Question

PHP

There is a simple catalog site with a separate editing page. How to make authorization for the edit page? Preferably without using mysql and registration.

Answer 1

if ($_SERVER['PHP_AUTH_USER']<>'login' OR $_SERVER['PHP_AUTH_PW']<>'pass')
{
    Header('WWW-Authenticate: Basic realm="Admins"');
    Header("HTTP/1.0 401 Unauthorized");
    exit;
}