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<?php $result = json_encode(['end' => json_decode(null, true)]); class A implements \JsonSerializable { function jsonSerialize() { return ['end' => json_decode(null, true)]; } } $a = new A(); $res = json_encode($a); var_dump($result); var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /in/lIePG on line 3 Deprecated: Return type of A::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/lIePG on line 6 Deprecated: json_decode(): Passing null to parameter #1 ($json) of type string is deprecated in /in/lIePG on line 8 string(12) "{"end":null}" string(12) "{"end":null}"

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