Predis\Connection\StreamConnection::read PHP Method

    public function read()
    {
        $socket = $this->getResource();
        $chunk = fgets($socket);
        if ($chunk === false || $chunk === '') {
            $this->onConnectionError('Error while reading line from the server.');
        }
        $prefix = $chunk[0];
        $payload = substr($chunk, 1, -2);
        switch ($prefix) {
            case '+':
                return StatusResponse::get($payload);
            case '$':
                $size = (int) $payload;
                if ($size === -1) {
                    return;
                }
                $bulkData = '';
                $bytesLeft = $size += 2;
                do {
                    $chunk = fread($socket, min($bytesLeft, 4096));
                    if ($chunk === false || $chunk === '') {
                        $this->onConnectionError('Error while reading bytes from the server.');
                    }
                    $bulkData .= $chunk;
                    $bytesLeft = $size - strlen($bulkData);
                } while ($bytesLeft > 0);
                return substr($bulkData, 0, -2);
            case '*':
                $count = (int) $payload;
                if ($count === -1) {
                    return;
                }
                $multibulk = array();
                for ($i = 0; $i < $count; ++$i) {
                    $multibulk[$i] = $this->read();
                }
                return $multibulk;
            case ':':
                $integer = (int) $payload;
                return $integer == $payload ? $integer : $payload;
            case '-':
                return new ErrorResponse($payload);
            default:
                $this->onProtocolError("Unknown response prefix: '{$prefix}'.");
                return;
        }
    }