Protocol Buffers 是一种轻便高效的结构化数据存储格式，可以用于结构化数据串行化，很适合做数据存储或 RPC 数据交换格式。它可用于通讯协议、数据存储等领域的语言无关、平台无关、可扩展的序列化结构数据格式。目前提供了 C++、Java、Python 三种语言的 API。

安装protoc编译器

下载安装

$ wget https://github.com/google/protobuf/releases/download/v2.5.0/protobuf-2.5.0.tar.gz
$ tar zxvf protobuf-2.5.0.tar.gz
$ cd protobuf-2.5.0
$ ./configure --prefix=/usr/local/protobuf
$ sudo make 
$ sudo  make install

安装验证：

$ /usr/local/protobuf/bin/protoc  --version
libprotoc 2.5.0

php扩展

安装php扩展

$ wget https://pecl.php.net/get/protocolbuffers-0.2.6.tgz
$ tar zxvf protocolbuffers-0.2.6.tgz
$ cd protocolbuffers-0.2.6
$ phpize
$ ./configure
$ sudo make 
$ sudo  make install

php.ini配置文件中添加 : extension = "protocolbuffers.so"

$ php -m | grep protocolbuffers
protocolbuffers

protoc插件

$ mkdir ~/code/app
$ cd ~/code/app
$ composer require protocolbuffers/protoc-gen-php

测试：

编写proto文件

$ vim demo.proto

syntax = "proto2";
package Proto.Demo;

message OrderInfo {
    required string name = 1 ;
    required int32 age = 2;
    required string amount = 3;
}

message UserInfo {
    required int32 uid = 1;
    required string address = 2;
}

生成php类库代码

$ /usr/local/protobuf/bin/protoc --plugin=vendor/bin/protoc-gen-php --php_out=. -I. demo.proto

编写测试文件：

$ vim demo.proto.php

<?php

spl_autoload_register(function($name){
  static $classmap;
  if (!$classmap) {
    $classmap = array(
      'Proto\Demo\OrderInfo' => '/Proto/Demo/OrderInfo.php',
      'Proto\Demo\UserInfo' => '/Proto/Demo/UserInfo.php',
      // @@protoc_insertion_point(autoloader_scope:classmap)
    );
  }
  if (isset($classmap[$name])) {
    require __DIR__ . DIRECTORY_SEPARATOR . $classmap[$name];
  }
});

call_user_func(function(){
  $registry = \ProtocolBuffers\ExtensionRegistry::getInstance();
  // @@protoc_insertion_point(extension_scope:registry)
});


$oi = new Proto\Demo\OrderInfo();
$oi->setName('Jack');
$oi->setAge(28);
$oi->setAmount('500');

//压缩数据
$protoData = $oi->serializeToString();
var_dump("压缩数据：");
var_dump($protoData);

//获取到$age的值
$obj = Proto\Demo\OrderInfo::parseFromString($protoData);
var_dump("获取数据：");
var_dump($obj->getName());
var_dump($obj->getAge());
var_dump($obj->getAmount());

测试

$ php demo.proto.php 

string(15) "压缩数据："
string(13) "
Jack500"
string(15) "获取数据："
string(4) "Jack"
string(2) "28"
string(3) "500"