PHP序列化对象树 [英] PHP Serialize object tree

问题描述

我有一个类似于以下的对象树，我需要对其进行序列化并将其存储在文件系统上.我需要具有所有类属性的完整层次结构，稍后我将反序列化并还原类层次结构.

I have an object tree like the following, which I need to serialize and store on the filesystem. I need the full hierarchy with all class properties and later I will unserialize and restore the class hierarchy.

class X implements \Serializable {

  private $x1;

    public function serialize() {
            return serialize(get_class_vars(get_class($this)));
    }

    public function unserialize($data) {
            $values = unserialize($data);
            foreach ($values as $key => $value) {
                    $this->$key = $value;
            }
    }
}

class A implements \Serializable {

  private $a1;
  private $a2;
  // type of a3 is class X!
  protected $a3;

    public function serialize() {
            return serialize(get_class_vars(get_class($this)));
    }

    public function unserialize($data) {
            $values = unserialize($data);
            foreach ($values as $key => $value) {
                    $this->$key = $value;
            }
    }
}

class B extends A implements \Serializable {

  private $b1;
  private $b2;

    public function serialize() {
    //  $base = parent::serialize();
            return serialize(get_class_vars(get_class($this)));
    }

    public function unserialize($data) {
            $values = unserialize($data);
            foreach ($values as $key => $value) {
                    $this->$key = $value;
            }
    }
}


class C extends A implements \Serializable {

  private $c1;
  private $c2;

    public function serialize() {
    //  $base = parent::serialize();
            return serialize(get_class_vars(get_class($this)));
    }

    public function unserialize($data) {
            $values = unserialize($data);
            foreach ($values as $key => $value) {
                    $this->$key = $value;
            }
    }
}

子类可以序列化自身，但是对于我不知道的基类，我如何组合序列化的数据.此外，我从文件系统中获取序列化数据，但我不知道我将获得哪个子类. PHP的unserialize()是否创建正确的类实例?它还应该初始化基类A.

The subclasses can serialize itself, but for the base class I don't know, how I can combine the serialized data. Furthermore I get serialized data from the filesystem, but I don't know, which subclass I will get. Does PHP's unserialize() create the right class instance? It should also initialize the base class A.

我该如何解决?

也许我可以使用var_dump()输出，但是如何将其存储到变量中?

Maybe I can use the var_dump() output, but how I can store it into a variable?

推荐答案

这是我建议序列化对象的方式:

This is how I would recommend serializing objects:

class Color implements \Serializable
{
    private $Name;
    private $Type;

    public function __construct(string $Name, int $Type)
    {
        $this->Name = $Name;
        $this->Type = $Type;
    }

    public function serialize()
    {
        $Props['Name'] = $this->Name;
        $Props['Type'] = $this->Type;
        return serialize($Props);
    }

    public function unserialize($Data)
    {
        list($this->Name, $this->Type) = unserialize($Data);
    }
}

class Blue extends Color
{
    private $Intensity;

    public function __construct()
    {
        parent::__construct('Blue', 10);
        $this->Intensity = 90;
    }

    public function serialize()
    {
        $Props['parent'] = parent::serialize();
        $Props['Intensity'] = $this->Intensity;
        return serialize($Props);
    }

    public function unserialize($Data)
    {
        $Obj = unserialize($Data);
        parent::unserialize($Obj['parent']);
        $this->Intensity = $Obj['Intensity'];
    }
}

传递给serialize()函数的任何对象都是您将以字符串形式返回到unserialize()的对象.如果走了这条路，则可以在trait中实现serialize()/unserialize()函数，并且get_object_vars()对于私有变量将正常工作.

Whichever object you pass in to the serialize() function is the object you will get back (as a string) to unserialize(). If you go your route, then you can implement the serialize()/unserialize() functions inside a trait and get_object_vars() will work properly for private variables.

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