Curl\Curl::parseHeaders PHP Method

    private function parseHeaders($raw_headers)
    {
        $raw_headers = preg_split('/\\r\\n/', $raw_headers, null, PREG_SPLIT_NO_EMPTY);
        $http_headers = new CaseInsensitiveArray();
        $raw_headers_count = count($raw_headers);
        for ($i = 1; $i < $raw_headers_count; $i++) {
            list($key, $value) = explode(':', $raw_headers[$i], 2);
            $key = trim($key);
            $value = trim($value);
            // Use isset() as array_key_exists() and ArrayAccess are not compatible.
            if (isset($http_headers[$key])) {
                $http_headers[$key] .= ',' . $value;
            } else {
                $http_headers[$key] = $value;
            }
        }
        return array(isset($raw_headers['0']) ? $raw_headers['0'] : '', $http_headers);
    }