### 进入例子目录

“`
cd $odp_root/php/phplib/protobuf/example
“`
### 编写proto文件

`foo.proto`文件如下：

message Foo
{
required int32 bar = 1;
optional string baz = 2;
repeated float spam = 3;
}

### 编译proto文件
“`
php ../protoc-php.php foo.proto
“`
编译后，可生成一个`pb_proto_foo.php`文件

### 编写用户代码

`example.php`文件如下

<?php
require_once ‘pb_proto_foo.php’;

$foo = new Foo();
$foo->setBar(1);
$foo->setBaz(‘two’);
$foo->appendSpam(3.0);
$foo->appendSpam(4.0);

$packed = $foo->serializeToString(); #打包

$foo->clear();

try {
$foo->parseFromString($packed); #解包
} catch (Exception $ex) {
die(‘Upss.. there is a bug in this example’);
}

$foo->dump();
?>

然后执行`php example.php`，预期结果：


Foo {
1: bar => 1
2: baz => ‘two’
3: spam(2) =>
[0] => 3
[1] => 4
}