you could use json_encode and json_decode as well, which will convert the array into the json text format.
It won't be as fast, but should still be saveable.
You could also look at third party library like https://github.com/protobuf-php/protobuf
It won't be as fast, but should still be saveable.
You could also look at third party library like https://github.com/protobuf-php/protobuf