1--TEST-- 2json_encode() Recursion test with JsonSerializable and serialize 3--FILE-- 4<?php 5 6class JsonEncodeFirstTest implements JsonSerializable 7{ 8 public $a = 1; 9 10 public function __serialize() 11 { 12 return [ 'result' => $this->a ]; 13 } 14 15 public function jsonSerialize(): mixed 16 { 17 return [ 'serialize' => serialize($this) ]; 18 } 19} 20 21class SerializeFirstTest implements JsonSerializable 22{ 23 public $a = 1; 24 25 public function __serialize() 26 { 27 return [ 'result' => json_encode($this) ]; 28 } 29 30 public function jsonSerialize(): mixed 31 { 32 return [ 'json' => serialize($this) ]; 33 } 34} 35 36var_dump(json_encode(new JsonEncodeFirstTest())); 37var_dump(serialize(new SerializeFirstTest())); 38?> 39--EXPECT-- 40string(68) "{"serialize":"O:19:\"JsonEncodeFirstTest\":1:{s:6:\"result\";i:1;}"}" 41string(113) "O:18:"SerializeFirstTest":1:{s:6:"result";s:62:"{"json":"O:18:\"SerializeFirstTest\":1:{s:6:\"result\";b:0;}"}";}" 42