(PHP 7 >= 7.2.0)
sodium_crypto_kdf_derive_from_key — Derive a subkey
sodium_crypto_kdf_derive_from_key ( int $subkey_len , int $subkey_id , string $context , string $key ) : string
This function is currently not documented; only its argument list is available.
subkey_len
subkey_id
context
key
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https://www.php.net/manual/en/function.sodium-crypto-kdf-derive-from-key.php