- var_dump: documentation ( source)
- mb_strlen: documentation ( source)
<?php
$keypair = sodium_crypto_sign_keypair();
$secret = sodium_crypto_sign_secretkey($keypair);
$public = sodium_crypto_sign_publickey($keypair);
var_dump(
mb_strlen($secret, '8bit'),
sodium_bin2hex($secret),
sodium_bin2hex($public)
);