<?php

// taken from: http://php.net/manual/en/function.http-response-code.php
// For 4.3.0 <= PHP <= 5.4.0
if (!function_exists('http_response_code')) {
    function http_response_code($code = null)
    {

        if ($code !== null) {
            switch ($code) {
                case 100:
                    $text = 'Continue';
                    break;
                case 101:
                    $text = 'Switching Protocols';
                    break;
                case 200:
                    $text = 'OK';
                    break;
                case 201:
                    $text = 'Created';
                    break;
                case 202:
                    $text = 'Accepted';
                    break;
                case 203:
                    $text = 'Non-Authoritative Information';
                    break;
                case 204:
                    $text = 'No Content';
                    break;
                case 205:
                    $text = 'Reset Content';
                    break;
                case 206:
                    $text = 'Partial Content';
                    break;
                case 300:
                    $text = 'Multiple Choices';
                    break;
                case 301:
                    $text = 'Moved Permanently';
                    break;
                case 302:
                    $text = 'Moved Temporarily';
                    break;
                case 303:
                    $text = 'See Other';
                    break;
                case 304:
                    $text = 'Not Modified';
                    break;
                case 305:
                    $text = 'Use Proxy';
                    break;
                case 400:
                    $text = 'Bad Request';
                    break;
                case 401:
                    $text = 'Unauthorized';
                    break;
                case 402:
                    $text = 'Payment Required';
                    break;
                case 403:
                    $text = 'Forbidden';
                    break;
                case 404:
                    $text = 'Not Found';
                    break;
                case 405:
                    $text = 'Method Not Allowed';
                    break;
                case 406:
                    $text = 'Not Acceptable';
                    break;
                case 407:
                    $text = 'Proxy Authentication Required';
                    break;
                case 408:
                    $text = 'Request Time-out';
                    break;
                case 409:
                    $text = 'Conflict';
                    break;
                case 410:
                    $text = 'Gone';
                    break;
                case 411:
                    $text = 'Length Required';
                    break;
                case 412:
                    $text = 'Precondition Failed';
                    break;
                case 413:
                    $text = 'Request Entity Too Large';
                    break;
                case 414:
                    $text = 'Request-URI Too Large';
                    break;
                case 415:
                    $text = 'Unsupported Media Type';
                    break;
                case 500:
                    $text = 'Internal Server Error';
                    break;
                case 501:
                    $text = 'Not Implemented';
                    break;
                case 502:
                    $text = 'Bad Gateway';
                    break;
                case 503:
                    $text = 'Service Unavailable';
                    break;
                case 504:
                    $text = 'Gateway Time-out';
                    break;
                case 505:
                    $text = 'HTTP Version not supported';
                    break;
                default:
                    exit('Unknown http status code "' . htmlentities($code) . '"');
                break;
            }

            $protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.1');

            header($protocol . ' ' . $code . ' ' . $text);

            $GLOBALS['http_response_code'] = $code;
        } else {
            $code = (isset($GLOBALS['http_response_code']) ? $GLOBALS['http_response_code'] : 200);
        }

        return $code;
    }
}

// taken from: http://php.net/manual/en/function.getallheaders.php
if (!function_exists('getallheaders')) {
    function getallheaders()
    {
        $headers = array();
        foreach ($_SERVER as $name => $value) {
            if (substr($name, 0, 5) == 'HTTP_') {
                $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
            }
        }
        return $headers;
    }
}