public function serializeToString()
    {
        $output = new CodedOutputStream($this->byteSize());
        $this->serializeToStream($output);
        return $output->getData();
    }
public function serializeToString()
    {
        $output = new CodedOutputStream($this->byteSize());
        $this->serializeToStream($output);
        return $output->getData();
    }
public function serializeToString ( ) { $ output = new CodedOutputStream ( $ this -> byteSize ( ) ) ; $ this -> serializeToStream ( $ output ) ; return $ output -> getData ( ) ; }
Serialize the message to string.
@return string Serialized binary protobuf data.
Serialize the message to string .