<?php
$request_method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : '';
$data_values = $request_method === 'POST' ? $_POST : $_GET;
$test = isset($data_values['test']) ? $data_values['test'] : '';
$key = isset($data_values['key']) ? $data_values['key'] : '';

if ($test == 'http_basic_auth') {
    if (!isset($_SERVER['PHP_AUTH_USER'])) {
        header('WWW-Authenticate: Basic realm="My Realm"');
        header('HTTP/1.0 401 Unauthorized');
        echo 'canceled';
        exit;
    }

    header('Content-Type: application/json');
    echo json_encode(array(
        'username' => $_SERVER['PHP_AUTH_USER'],
        'password' => $_SERVER['PHP_AUTH_PW'],
    ));
    exit;
}

header('Content-Type: text/plain');

$data_mapping = array(
    'cookie' => '_COOKIE',
    'delete' => '_GET',
    'post' => '_POST',
    'put' => '_GET',
    'server' => '_SERVER',
);

$data = $$data_mapping[$test];
$value = isset($data[$key]) ? $data[$key] : '';
echo $value;