PHP Encryption with libsodium

Message:
This text is secret

Ciphertext:
3802aa5497e625413afa85d651471eb0ab376419a0f63c608b7b2675fb2b6271121ea7faf86246ac943bdee45a7da81ce6b48ea9483700bfb6e88eb5a48c7712694ffefaabf655c331b0

Plaintext:
This text is secret