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业务需要用protobuffer 进行通讯。
client: php
server: c++
在github 上找到 Protobuf-PHP （https://github.com/drslump/Protobuf-PHP） 的评分不错，故采用它作为协议生成库来生成PHP侧的交互协议。
生成php proto
protoc --plugin=/usr/local/php/bin/protoc-gen-php --php_out=. -I. tutorial.proto
报错：--php_out: protoc-gen-php: Plugin output is unparseable.
proto 文件 tutorial.proto 如下：
package tutorial; message Person { required string name = 1; required int32 id = 2; optional string email = 3; enum PhoneType { MOBILE = 0; HOME = 1; WORK = 2; } message PhoneNumber { required string number = 1; optional PhoneType type = 2 [default = HOME]; } repeated PhoneNumber phone = 4; } message AddressBook { repeated Person person = 1; }
PHP日志跟踪发现：
[13-Apr-2015 15:33:55 GMT] PHP Warning: Missing argument 2 for DrSlump\Protobuf\Codec\Binary::getWireType(), called in /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php on line 249 and defined in /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php on line 333 [13-Apr-2015 15:33:55 GMT] PHP Stack trace: [13-Apr-2015 15:33:55 GMT] PHP 1. {main}() /usr/local/services/php-5.4.39/bin/protoc-gen-php:0 [13-Apr-2015 15:33:55 GMT] PHP 2. DrSlump\Protobuf\Compiler\Cli::run() /usr/local/services/php-5.4.39/bin/protoc-gen-php:43 [13-Apr-2015 15:33:55 GMT] PHP 3. DrSlump\Protobuf\Compiler->compile() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Compiler/Cli.php:55 [13-Apr-2015 15:33:55 GMT] PHP 4. DrSlump\Protobuf\Message->__construct() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Compiler.php:104 [13-Apr-2015 15:33:55 GMT] PHP 5. DrSlump\Protobuf\Message->parse() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Message.php:56 [13-Apr-2015 15:33:55 GMT] PHP 6. DrSlump\Protobuf\Codec\Binary->decode() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Message.php:107 [13-Apr-2015 15:33:55 GMT] PHP 7. DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php:65 [13-Apr-2015 15:33:55 GMT] PHP 8. DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php:266 [13-Apr-2015 15:33:55 GMT] PHP 9. DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php:266 [13-Apr-2015 15:33:55 GMT] PHP 10. DrSlump\Protobuf\Codec\Binary->decodeMessage() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php:266 [13-Apr-2015 15:33:55 GMT] PHP 11. DrSlump\Protobuf\Codec\Binary->getWireType() /usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php:249
跟入代码发现：/usr/local/services/php-5.4.39/lib/php/DrSlump/Protobuf/Codec/Binary.php 中的第249行，
$wire = $this->getWireType($type);
参数传递异常。
发现需要传入2个参数，于是修改为：
$wire = $this->getWireType($type, null);
重新执行
protoc-gen-php --out=./ -i. -Dsuffix=.proto.php tutorial.proto
生成成功：tutorial.proto.php
另一种方式：
protoc --plugin=/usr/local/php/bin/protoc-gen-php --php_out=. -I. tutorial.proto
生成成功：tutorial.php
协议已经成功生成。
protoc-gen-php --php_out: protoc-gen-php: Plugin output is unparseable.
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原文地址：http://www.cnblogs.com/brookin/p/4423692.html
