Libsodium "Call to undefined function sodium_randombytes_buf" [closed] - php

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Trying to follow the examples here, but it gives me
Fatal error: Uncaught Error: Call to undefined function sodium_randombytes_buf()
On top of that, the key pairs seems to be generating weird strings like:
kÿòjƒFDú{î—4]F◊î¸˜ßˆu…®_•A∞+.
Is that normal?
Here's my code
<?php
// send
$message = 'Hi, this is Alice';
$alice_to_bob_kp = sodium_crypto_box_keypair_from_secretkey_and_publickey(
file_get_contents('./keys/sec-user-1_box_key.txt'),
file_get_contents('./keys/pub-user-2_box_key.txt')
);
$nonce = sodium_randombytes_buf(SODIUM_CRYPTO_BOX_NONCEBYTES);
$ciphertext = sodium_crypto_box(
$message,
$nonce,
$alice_to_bob_kp
);
// receive
$bob_to_alice_kp = sodium_crypto_box_keypair_from_secretkey_and_publickey(
// $bob_box_secretkey,
// $alice_box_publickey
file_get_contents('./keys/sec-user-2_box_key.txt'),
file_get_contents('./keys/pub-user-1_box_key.txt')
);
$nonce = sodium_randombytes_buf(SODIUM_CRYPTO_BOX_NONCEBYTES);
$plaintext = sodium_crypto_box_open(
$ciphertext,
$nonce,
$bob_to_alice_kp
);
if ($plaintext === false) {
die("Malformed message or invalid MAC");
}
die($plaintext);

Answer 1

There is no such function as sodium_randombytes_buf() the code in the example uses \Sodium\randombytes_buf().
Edit:
From the bug history:
"The sodium_randombytes_* symbols have been removed a while back, as PHP now provide similar functions without this extension"
Bug #74896 sodium's .h defines some functions without .c implementation