CSV encoder 

这个编解码器对于把程序数据“导入/导出”为类似Excel这种格式十分理想：

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// instantiation, when using it as a component
// 作为组件使用时的实例化
use Symfony\Component\Serializer\Serializer;
use Symfony\Component\Serializer\Encoder\CsvEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
 
$serializer = new Serializer([new ObjectNormalizer()], [new CsvEncoder()]);
 
// instantiation, when using it inside the Symfony framework
// 在Symfony框架内部使用时的实例化
$serializer = $container->get('serializer');
 
// encoding contents in CSV format / 编码为CSV格式
$serializer->encode($data, 'csv');
 
// decoding CSV contents / 对CSV内容解码
$data = $serializer->decode(file_get_contents('data.csv'), 'csv');

当对CSV内容解码时，内容第一行必须是带有列名的header，它将被转换成对象属性。

CSV编解码器也支持复杂的嵌套数据结构：

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$data = [
    'foo' => 'aaa',
    'bar' => [
        ['id' => 111, 1 => 'bbb'],
        ['lorem' => 'ipsum'],
    ]
];
 
file_put_contents(
    'data.csv',
    $container->get('serializer')->encode($data, 'csv')
);
 
// data.csv:
// foo,bar.0.id,bar.0.1,bar.1.lorem
// aaa,111,bbb,ipsum

YAML encoder 

这个编码器使用了Symfony Yaml组件提供的超有名的YAML parser/dumper。定义encode()和decode()可选的第三个参数，即可定义YAML旗标（flag）的值，以及缩进距离（indentation spaces），等等。

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$obj = new \stdClass();
$obj->bar = 2;
 
$data = $this->container->get('serializer')->encode(
    ['foo' => $obj],
    'yaml'
    // these are the default values applied by the encoder
    // 这些是编码器提供的默认的值
    ['yaml_inline' => 1, 'yaml_indent' => 4, 'yaml_flags' => 0]
);
// $data = '    foo: !php/object:O:8:\"stdClass\":1:{s:3:\"bar\";i:2;}\n';
 
$data = $this->container->get('serializer')->decode(
    'foo: !php/object:O:8:"stdClass":1:{s:3:"bar";i:2;}',
    'yaml'
);
// $data = ['foo' => $obj];
 
$data = $this->container->get('serializer')->decode(
    'foo: !php/object:O:8:"stdClass":1:{s:3:"bar";i:2;}',
    'yaml',
    ['yaml_flags' => 0]
);
// $data = ['foo' => null];