Serializing PHP object to JSON

2019-01-03 23:09发布

So I was wandering around php.net for information about serializing PHP objects to JSON, when I stumbled across the new JsonSerializable Interface. It's only PHP >= 5.4 though, and I'm running in a 5.3.x environment.

How is this sort of functionality achieved PHP < 5.4?

I've not worked much with JSON yet, but I'm trying to support an API layer in an application, and dumping the data object (that would otherwise be sent to the view) into JSON would be perfect.

If I attempt to serialize the object directly, it returns an empty JSON string; which is because I assume json_encode() doesn't know what the heck to do with the object. Should I recursively reduce the object into an array, and then encode that?


Example

$data = new Mf_Data();
$data->foo->bar['hello'] = 'world';

echo json_encode($data) produces an empty object:

{}

var_dump($data) however, works as expected:

object(Mf_Data)#1 (5) {
  ["_values":"Mf_Data":private]=>
  array(0) {
  }
  ["_children":"Mf_Data":private]=>
  array(1) {
    [0]=>
    array(1) {
      ["foo"]=>
      object(Mf_Data)#2 (5) {
        ["_values":"Mf_Data":private]=>
        array(0) {
        }
        ["_children":"Mf_Data":private]=>
        array(1) {
          [0]=>
          array(1) {
            ["bar"]=>
            object(Mf_Data)#3 (5) {
              ["_values":"Mf_Data":private]=>
              array(1) {
                [0]=>
                array(1) {
                  ["hello"]=>
                  string(5) "world"
                }
              }
              ["_children":"Mf_Data":private]=>
              array(0) {
              }
              ["_parent":"Mf_Data":private]=>
              *RECURSION*
              ["_key":"Mf_Data":private]=>
              string(3) "bar"
              ["_index":"Mf_Data":private]=>
              int(0)
            }
          }
        }
        ["_parent":"Mf_Data":private]=>
        *RECURSION*
        ["_key":"Mf_Data":private]=>
        string(3) "foo"
        ["_index":"Mf_Data":private]=>
        int(0)
      }
    }
  }
  ["_parent":"Mf_Data":private]=>
  NULL
  ["_key":"Mf_Data":private]=>
  NULL
  ["_index":"Mf_Data":private]=>
  int(0)
}

Addendum

1)

So this is the toArray() function I've devised for the Mf_Data class:

public function toArray()
{
    $array = (array) $this;
    array_walk_recursive($array, function (&$property) {
        if ($property instanceof Mf_Data) {
            $property = $property->toArray();
        }
    });
    return $array;
}

However since the Mf_Data objects also have a reference to their parent (containing) object, this fails with recursion. Works like a charm though when I remove the _parent reference.

2)

Just to follow up, the final function to transform a complex tree-node object I went with was:

// class name - Mf_Data
// exlcuded properties - $_parent, $_index
public function toArray()
{
    $array = get_object_vars($this);
    unset($array['_parent'], $array['_index']);
    array_walk_recursive($array, function (&$property) {
        if (is_object($property) && method_exists($property, 'toArray')) {
            $property = $property->toArray();
        }
    });
    return $array;
}

3)

I'm following up again, with a bit cleaner of an implementation. Using interfaces for an instanceof check seems much cleaner than method_exists() (however method_exists() does cross-cut inheritance/implementation).

Using unset() seemed a bit messy too, and it seems that logic should be refactored into another method. However, this implementation does copy the property array (due to array_diff_key), so something to consider.

interface ToMapInterface
{

    function toMap();

    function getToMapProperties();

}

class Node implements ToMapInterface
{

    private $index;
    private $parent;
    private $values = array();

    public function toMap()
    {
        $array = $this->getToMapProperties();
        array_walk_recursive($array, function (&$value) {
            if ($value instanceof ToMapInterface) {
                $value = $value->toMap();
            }
        });
        return $array;
    }

    public function getToMapProperties()
    {
        return array_diff_key(get_object_vars($this), array_flip(array(
            'index', 'parent'
        )));
    }

}

10条回答
我欲成王,谁敢阻挡
2楼-- · 2019-01-03 23:12

json_encode() will only encode public member variables. so if you want to include the private once you have to do it by yourself (as the others suggested)

查看更多
Luminary・发光体
3楼-- · 2019-01-03 23:16

Just implement an Interface given by PHP JsonSerializable.

查看更多
我欲成王,谁敢阻挡
4楼-- · 2019-01-03 23:19

Since your object type is custom, I would tend to agree with your solution - break it down into smaller segments using an encoding method (like JSON or serializing the content), and on the other end have corresponding code to re-construct the object.

查看更多
我只想做你的唯一
5楼-- · 2019-01-03 23:20

Try using this, this worked fine for me.

json_encode(unserialize(serialize($array)));
查看更多
Evening l夕情丶
6楼-- · 2019-01-03 23:21

In the simplest cases type hinting should work:

$json = json_encode( (array)$object );
查看更多
男人必须洒脱
7楼-- · 2019-01-03 23:22

edit: it's currently 2016-09-24, and PHP 5.4 has been released 2012-03-01, and support has ended 2015-09-01. Still, this answer seems to gain upvotes. If you're still using PHP < 5.4, your are creating a security risk and endagering your project. If you have no compelling reasons to stay at <5.4, or even already use version >= 5.4, do not use this answer, and just use PHP>= 5.4 (or, you know, a recent one) and implement the JsonSerializable interface


You would define a function, for instance named getJsonData();, which would return either an array, stdClass object, or some other object with visible parameters rather then private/protected ones, and do a json_encode($data->getJsonData());. In essence, implement the function from 5.4, but call it by hand.

Something like this would work, as get_object_vars() is called from inside the class, having access to private/protected variables:

function getJsonData(){
    $var = get_object_vars($this);
    foreach ($var as &$value) {
        if (is_object($value) && method_exists($value,'getJsonData')) {
            $value = $value->getJsonData();
        }
    }
    return $var;
}
查看更多
登录 后发表回答