(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_auth — Compute a tag for the message
$message, string $key): stringSymmetric message authentication via sodium_crypto_auth() provides integrity, but not confidentiality.
Unlike with digital signatures (e.g. sodium_crypto_sign_detached()), any party capable of verifying a message is also capable of authenticating their own messages. (Hence, symmetric authentication.)
messageThe message you intend to authenticate
keyAuthentication key
Authentication tag