Web::acceptable PHP Method

    function acceptable($list = NULL)
    {
        $accept = [];
        foreach (explode(',', str_replace(' ', '', @$_SERVER['HTTP_ACCEPT'])) as $mime) {
            if (preg_match('/(.+?)(?:;q=([\\d\\.]+)|$)/', $mime, $parts)) {
                $accept[$parts[1]] = isset($parts[2]) ? $parts[2] : 1;
            }
        }
        if (!$accept) {
            $accept['*/*'] = 1;
        } else {
            krsort($accept);
            arsort($accept);
        }
        if ($list) {
            if (is_string($list)) {
                $list = explode(',', $list);
            }
            foreach ($accept as $mime => $q) {
                if ($q && ($out = preg_grep('/' . str_replace('\\*', '.*', preg_quote($mime, '/')) . '/', $list))) {
                    return current($out);
                }
            }
            return FALSE;
        }
        return $accept;
    }