dolphin/authentication/http-auth.php

<?php
/**
 *  dolphin. Collection of useful PHP skeletons.
 *  Copyright (C) 2017  Johannes 'Banana' Keßler
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the COMMON DEVELOPMENT AND DISTRIBUTION LICENSE
 *
 * You should have received a copy of the
 * COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
 * along with this program.  If not, see http://www.sun.com/cddl/cddl.html
 */

/**
 * simple HTTP auth method with PHP
 * more details can be found here:
 * http://php.net/manual/en/features.http-auth.php
 */

# place this anywhere you need it.
# define FRONTEND_USERNAME and FRONTEND_PASSWORD as a constand
simpleAuth();

function simpleAuth() {
    if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW'])
    || $_SERVER['PHP_AUTH_USER'] !== FRONTEND_USERNAME || $_SERVER['PHP_AUTH_PW'] !== FRONTEND_PASSWORD
    ) {
        header('WWW-Authenticate: Basic realm="Your secret area"');
        header('HTTP/1.0 401 Unauthorized');
        echo 'No Access.';
        exit;
    }
}

?>