- substr: documentation ( source)
- var_dump: documentation ( source)
- bin2hex: documentation ( source)
<?php
var_dump(substr(bin2hex(openssl_random_pseudo_bytes(128)), 40, 168));
var_dump(substr(bin2hex(openssl_random_pseudo_bytes(128)), 40, 168));
var_dump(substr(bin2hex(openssl_random_pseudo_bytes(128)), 40, 168));