... &&!isset( $PHP_ AUTH_USER) &&!isset( $PHP_ AUTH_PW) &&substr($HTTP_AUTHORIZATION, 0, 6) == “Basic “){list( $PHP_ AUTH_USER, $PHP_ AUTH_PW) =explode(“:”, base64_decode(substr($HTTP_AUTHORIZATION, ... 14.4 http .php PHP Can Trigger HTTP Basic Authentication<?// if we are using IIS, we need to set $PHP_ AUTH_USER and $PHP_ AUTH_PWif (substr($SERVER_SOFTWARE, 0, 9) == “Microsoft” &&!isset( $PHP_ AUTH_USER) ... with one password.Implementing Authentication with PHP and MySQL CHAPTER 1414IMPLEMENTINGAUTHENTICATION31318 78 42 CH14 3/6/01 3:35 PM Page 313Protecting Multiple PagesMaking a script like...