(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_stream — Generate a deterministic sequence of bytes from a seed
$length, string $nonce, string $key): stringGenerate a deterministic sequence of bytes from a seed, using the XSalsa20 stream cipher.
lengthThe number of bytes to return.
nonceA number that must be only used once, per message. 24 bytes long. This is a large enough bound to generate randomly (i.e. random_bytes()).
keyEncryption key (256-bit).
String of pseudorandom bytes.