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<?php class SomeClass implements JsonSerializable { public function jsonSerialize() { return [get_object_vars($this)]; } } $class = new SomeClass; var_dump(json_encode($class)); var_dump(json_last_error() == JSON_ERROR_RECURSION); $arr = [$class]; var_dump(json_encode($arr)); var_dump(json_last_error() == JSON_ERROR_RECURSION); class SomeOtherClass implements JsonSerializable { public function jsonSerialize() { return get_object_vars($this); } } $class = new SomeOtherClass; var_dump(json_encode($class)); var_dump(json_last_error() == JSON_ERROR_RECURSION); $arr = [$class]; var_dump(json_encode($arr)); var_dump(json_last_error() == JSON_ERROR_RECURSION);
Output for git.master, git.master_jit, rfc.property-hooks
Deprecated: Return type of SomeClass::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/OoR7D on line 4 string(4) "[[]]" bool(false) string(6) "[[[]]]" bool(false) Deprecated: Return type of SomeOtherClass::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/OoR7D on line 19 string(2) "[]" bool(false) string(4) "[[]]" bool(false)

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