http_responce_code function polyfill from http://php.net/manual/en/function.http-response-code.php

http_response_code.php

<?php
/**
 * http_responce_code function polyfill.
 * http://php.net/manual/en/function.http-response-code.php
 *
 * @param number $code
 * @return string
 */
if (!function_exists('http_response_code')) {
    function http_response_code ($code = NULL) {     
        $prev_code = (isset($GLOBALS['http_response_code']) ? $GLOBALS['http_response_code'] : 200);

        if ($code === NULL) {
            return $prev_code;
        }

        switch ($code) {
            case 100:
                $text = 'Continue';
                break;
            case 101:
                $text = 'Switching Protocols';
                break;
            case 102:
                $text = 'Processing';
                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 207:
                $text = 'Multi-Status';
                break;
            case 208:
                $text = 'Already Reported';
                break;
            case 226:
                $text = 'IM Used';
                break;
            case 300:
                $text = 'Multiple Choices';
                break;
            case 301:
                $text = 'Moved Permanently';
                break;
            case 302:
                $text = 'Found';
                break;
            case 303:
                $text = 'See Other';
                break;
            case 304:
                $text = 'Not Modified';
                break;
            case 305:
                $text = 'Use Proxy';
                break;
            case 306:
                $text = '(Unused)';
                break;
            case 307:
                $text = 'Temporary Redirect';
                break;
            case 308:
                $text = 'Permanent Redirect';
                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 Timeout';
                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 = 'Payload Too Large';
                break;
            case 414:
                $text = 'URI Too Long';
                break;
            case 415:
                $text = 'Unsupported Media Type';
                break;
            case 416:
                $text = 'Range Not Satisfiable';
                break;
            case 417:
                $text = 'Expectation Failed';
                break;
            case 418:
                $text = 'I\'m a teapot';
                break;
            case 421:
                $text = 'Misdirected Request';
                break;
            case 422:
                $text = 'Unprocessable Entity';
                break;
            case 423:
                $text = 'Locked';
                break;
            case 424:
                $text = 'Failed Dependency';
                break;
            case 426:
                $text = 'Upgrade Required';
                break;
            case 428:
                $text = 'Precondition Required';
                break;
            case 429:
                $text = 'Too Many Requests';
                break;
            case 431:
                $text = 'Request Header Fields Too Large';
                break;
            case 451:
                $text = 'Unavailable For Legal Reasons';
                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 Timeout';
                break;
            case 505:
                $text = 'HTTP Version Not Supported';
                break;
            case 506:
                $text = 'Variant Also Negotiates';
                break;
            case 507:
                $text = 'Insufficient Storage';
                break;
            case 508:
                $text = 'Loop Detected';
                break;
            case 510:
                $text = 'Not Extended';
                break;
            case 511:
                $text = 'Network Authentication Required';
                break;
            default:
                $code = 500;
                $text = 'Internal Server Error';
                break;
        }

        $protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0');
        header($protocol . ' ' . $code . ' ' . $text);
        $GLOBALS['http_response_code'] = $code;

        return $prev_code;
    }
}