http_responce_code function polyfill #2 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;
        }

        header('X-Temporary-Header: none', true, $code);
        header_remove('X-Temporary-Header');

        $GLOBALS['http_response_code'] = $code;

        return $prev_code;
    }
}