php – 不要使用Symfony序列化程序显示null元素
所以我有很多我想用Symfony序列化程序序列化的类.例如 class Foo { public $apple = 1; public $pear = null; public function serialize() { Utils::serialize($this); } } 我使用以下serialize()调用序列化: class Utils { public static function serialize($object) { $encoder = new XmlEncoder(); $normalizer = new ObjectNormalizer(); $serializer = new Serializer(array($normalizer),array($encoder)); $str = $serializer->serialize($object,'xml') } } 产生的输出给了我: <apple>1</apple><pear/> 预期的输出应为: <apple>1</apple> 我查看了Symfony 2.8 doc,并设法通过使用$normalizer-> setIgnoredAttributes(“pear”)找到了一个快速解决方案. 所以改进的序列化静态函数看起来像这样 class Utils { public static function ignoreNullAttributes($object) { $ignored_attributes = array(); foreach($object as $member => $value) { if (is_null($object->$member)) { array_push($ignored_attributes,$member); } } return $ignored_attributes; } public static function serialize($object) { $encoder = new XmlEncoder(); $normalizer = new ObjectNormalizer(); $normalizer->setIgnoredAttributes(Utils::ignoreNullAttributes($object)); $serializer = new Serializer(array($normalizer),'xml') } } 然而,这个解决方案并不满足我,因为我有更复杂的情况,其中不同的Foo可以由同一个类拥有.例如 class Bar { public $foo1; // (apple=null; pear=2) public $foo2; // (apple=2; pear=null) public function serialize() { Utils::serialize($this); } } 这里我不能使用setIgnoredAttributes方法,因为$foo1和$foo2没有相同的null元素.此外,我不在这里从子类(即Foo)调用serialize方法,因此setIgnoredAttributes为空. 无需编写复杂的内省代码,如何使用Symfony 2.8序列化器默认隐藏null元素?例如,我已经看到它默认启用了JMSSerializer. 解决方案是从ObjectNormalizer类扩展,覆盖normalize()方法并删除那里的所有空值:use SymfonyComponentSerializerNormalizerObjectNormalizer; use SymfonyComponentSerializerSerializer; use SymfonyComponentSerializerEncoderXmlEncoder; class CustomObjectNormalizer extends ObjectNormalizer { public function normalize($object,$format = null,array $context = []) { $data = parent::normalize($object,$format,$context); return array_filter($data,function ($value) { return null !== $value; }); } } $encoders = array(new XmlEncoder()); $normalizers = array(new CustomObjectNormalizer()); $serializer = new Serializer($normalizers,$encoders); // ... 如果我们有一个Person like the one of the official documentation的数组: // ... $person1 = new Person(); $person1->setName('foo'); $person1->setAge(null); $person1->setSportsman(false); $person2 = new Person(); $person2->setName('bar'); $person2->setAge(33); $person2->setSportsman(null); $persons = array($person1,$person2); $xmlContent = $serializer->serialize($persons,'xml'); echo $xmlContent; 结果将是那些非空节点: <?xml version="1.0"?> <response> <item key="0"> <name>foo</name> <sportsman>0</sportsman> </item> <item key="1"> <name>bar</name> <age>33</age> </item> </response> (编辑:安卓应用网) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |