<?php header("Content-Type: text/html;charset=utf-8"); class a implements JsonSerializable{ public $b1 = 1; private $b2 = 2; protected $b3 = 3; // 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){ $data[$key] = $val; } return $data; } } $json = json_encode(new a); echo $json;

官网文档地址： https://php.net/manual/en/class.jsonserializable.php

json_encode类时丢失私有属性和受保护属性处理方法