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Solution to the problem that php json_encode does not support object private attributes
- jackloveOriginal
- 2018-06-15 17:10:293376browse
This article introduces the solution for php json_encode that does not support the private properties of objects. json_encode can convert the object into json format, and use json_decode to restore it to the object.
But if the object contains private attributes, the private attributes will be lost after executing json_encode.
Example: json_encode loses object private attributes
<?php// 用户类class user{
public $id = 1; public $name = 'fdipzone'; public $profession = 'programmer'; private $age = 18;
}// 对象$oUser = new User;// json_encode$json = json_encode($oUser);echo $json;// json_decode$oUser = json_decode($json);
var_dump($oUser);?>Output:
{"id":1,"name":"fdipzone","profession":"programmer"}object(stdClass)[2] public 'id' => int 1
public 'name' => string 'fdipzone' (length=8) public 'profession' => string 'programmer' (length=10)After executing json_encode, the private attribute age is lost.
Solution to the loss of private attributes of the object after json_encode
We can modify the class to implement JsonSerializableInterface method of abstract classjsonSerialize, specify Data that needs to be serialized into JSON.
For the JsonSerializable::jsonSerialize method, please refer to the official website: http://php.net/manual/zh/jsonserializable.jsonserialize.php
After modification The code is as follows:
<?php// 用户类class user implements JsonSerializable{
public $id = 1; public $name = 'fdipzone'; public $profession = 'programmer'; private $age = 18; // 实现的抽象类方法，指定需要被序列化JSON的数据
public function jsonSerialize() {
$data = []; foreach ($this as $key=>$val){ if ($val !== null) $data[$key] = $val;
} return $data;
}
}// 对象$oUser = new User;// json_encode$json = json_encode($oUser);echo $json;// json_decode$oUser = json_decode($json);
var_dump($oUser);?>Output:
{"id":1,"name":"fdipzone","profession":"programmer","age":18}object(stdClass)[2] public 'id' => int 1
public 'name' => string 'fdipzone' (length=8) public 'profession' => string 'programmer' (length=10) public 'age' => int 18After specifying the data that needs to be serialized into JSON, json_encode can read the private attribute age.
This article introduces the solution to the problem that php json_encode does not support the private properties of objects. json_encode can convert the object into json format, and use json_decode to restore it to the object.
But if the object contains private attributes, the private attributes will be lost after executing json_encode.
Example: json_encode loses object private attributes
<?php// 用户类class user{
public $id = 1; public $name = 'fdipzone'; public $profession = 'programmer'; private $age = 18;
}// 对象$oUser = new User;// json_encode$json = json_encode($oUser);echo $json;// json_decode$oUser = json_decode($json);
var_dump($oUser);?>Output:
{"id":1,"name":"fdipzone","profession":"programmer"}object(stdClass)[2] public 'id' => int 1
public 'name' => string 'fdipzone' (length=8) public 'profession' => string 'programmer' (length=10)After executing json_encode, the private attribute age is lost.
Solution to the loss of private attributes of the object after json_encode
We can modify the class to implement JsonSerializableInterface method of abstract classjsonSerialize, specify Data that needs to be serialized into JSON.
For the JsonSerializable::jsonSerialize method, please refer to the official website: http://php.net/manual/zh/jsonserializable.jsonserialize.php
After modification The code is as follows:
<?php// 用户类class user implements JsonSerializable{
public $id = 1; public $name = 'fdipzone'; public $profession = 'programmer'; private $age = 18; // 实现的抽象类方法，指定需要被序列化JSON的数据
public function jsonSerialize() {
$data = []; foreach ($this as $key=>$val){ if ($val !== null) $data[$key] = $val;
} return $data;
}
}// 对象$oUser = new User;// json_encode$json = json_encode($oUser);echo $json;// json_decode$oUser = json_decode($json);
var_dump($oUser);?>Output:
{"id":1,"name":"fdipzone","profession":"programmer","age":18}object(stdClass)[2] public 'id' => int 1
public 'name' => string 'fdipzone' (length=8) public 'profession' => string 'programmer' (length=10) public 'age' => int 18After specifying the data that needs to be serialized into JSON, json_encode can read the private attribute age.
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