Online PHP editor | output for OZb1n

<?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, ]);