【PHP】basic認証

basic_php.php

/*#################################################
# phpでbasic認証したい場合
#################################################*/
<?php

// GoogleAppEngineの場合、以下の処理が必要
// 参考：http://d.hatena.ne.jp/chi-bd/20150815/1439620561
if (!isset($_SERVER['PHP_AUTH_USER']) and isset($_SERVER['HTTP_AUTHORIZATION'])) {
    $arr = explode(" ", $_SERVER['HTTP_AUTHORIZATION']);
    $arr = explode(":", base64_decode($arr[1]));
    $_SERVER['PHP_AUTH_USER'] = $arr[0];
    $_SERVER['PHP_AUTH_PW']   = $arr[1];
}

$loginid = 'hoge';
$password = 'hogehoge';
switch (true) {
    case !isset($_SERVER['PHP_AUTH_USER'], $_SERVER['PHP_AUTH_PW']):
    case $_SERVER['PHP_AUTH_USER'] !== $loginid:
    case $_SERVER['PHP_AUTH_PW']   !== $password:
        header('WWW-Authenticate: Basic realm="Enter username and password."');
        header('Content-Type: text/plain; charset=utf-8');
        die('このページを見るにはログインが必要です');
}