Sphinx\SphinxClient::getResponse PHP Method

    private function getResponse($fp, $clientVer)
    {
        $response = '';
        $len = 0;
        $header = fread($fp, 8);
        if (strlen($header) === 8) {
            list($status, $ver, $len) = array_values(unpack('n2a/Nb', $header));
            $left = $len;
            while ($left > 0 && !feof($fp)) {
                $chunk = fread($fp, min(8192, $left));
                if ($chunk) {
                    $response .= $chunk;
                    $left -= strlen($chunk);
                }
            }
        }
        if ($this->socket === false) {
            fclose($fp);
        }
        // check response
        $read = strlen($response);
        if (!$response || $read != $len) {
            $this->error = $len ? sprintf('failed to read searchd response (status=%d, ver=%d, len=%d, read=%d)', $status, $ver, $len, $read) : 'received zero-sized searchd response';
            return false;
        }
        // check status
        if ($status === self::SEARCHD_WARNING) {
            list(, $wlen) = unpack('N*', substr($response, 0, 4));
            $this->warning = substr($response, 4, $wlen);
            return substr($response, 4 + $wlen);
        }
        if ($status === self::SEARCHD_ERROR) {
            $this->error = 'searchd error: ' . substr($response, 4);
            return false;
        }
        if ($status === self::SEARCHD_RETRY) {
            $this->error = 'temporary searchd error: ' . substr($response, 4);
            return false;
        }
        if ($status !== self::SEARCHD_OK) {
            $this->error = sprintf('unknown status code \'%d\'', $status);
            return false;
        }
        // check version
        if ($ver < $clientVer) {
            $this->warning = sprintf('searchd command v.%d.%d older than client\'s v.%d.%d, some options might not work', $ver >> 8, $ver & 0xff, $clientVer >> 8, $clientVer & 0xff);
        }
        return $response;
    }