序列化爲XML（但不是JSON）時出現異常

Question

我正在使用Symfony 3.3序列化程序。此代碼：

$serialized = $this->serializer->serialize($input, "json"); 

回報：

{ 
    "title": "dsd", 
    "description": null, 
    "source": null, 
    "tags": null, 
    "objectId": null, 
    "attributes": { 
     "sdffds": "sdffsdfsd", 
     "fsfdsfd": "sdfsdfsdf" 
    }, 
    "features": [], 
    "lifecycleStart": null, 
    "lifecycleEnd": null, 
    "attachments": { 
     "20170625194534-595012dee26c8": { 
      "original": "favicon (1).ico", 
      "filename": "favicon (1).ico", 
      "size": "318", 
      "title": null, 
      "description": null, 
      "reader": null 
     } 
    } 
} 

Unforutnately，運行

$serialized = $this->serializer->serialize($input, "xml"); 

將拋出一個異常：

Uncaught PHP Exception DOMException: "Invalid Character Error" at /www/site/ui/vendor/symfony/symfony/src/Symfony/Component/Serializer/Encoder/XmlEncoder.php line 454 

我敢肯定我沒有包括任何有趣的角色。你有任何想法我是否做錯了什麼，或者它可能是一個symfony錯誤？

Answer 1

這可能是因爲20170625194534-595012dee26c8。 XML元素名稱不能以數字開頭。請參閱：XML.com上的The Naming of Parts文章。