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<?php enum MyEnum: string { case FOO = 'FOO'; } enum MyEnumWithJson: string implements \JsonSerializable { case FOO = 'FOO'; public function jsonSerialize(): mixed { return $this->value . '[jsonSerialize]'; } } $myEnum = MyEnum::FOO; echo json_encode($myEnum); var_dump([ 'isObject' => is_object($myEnum), 'isJsonSerializable' => $myEnum instanceof JsonSerializable, ]); echo "\n"; $myEnumWithJson = MyEnumWithJson::FOO; echo json_encode($myEnumWithJson); var_dump([ 'isObject' => is_object($myEnumWithJson), 'isJsonSerializable' => $myEnumWithJson instanceof JsonSerializable, ]);

This is an error 500

Value for `_results` contains invalid data `array`


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