PHP Encryption with libsodium

Message:
This text is secret

Ciphertext:
1215488345c42aceaf9c09610864db486587a561272ca3428b777b5d9eda26040784e51e25e7077603b6a372b0a9bcbaccd88eefb48a730dbdf9bbe08c3198df7a729de303085d27a12f

Plaintext:
This text is secret