Sending a Code to an Email Address in CodeIgniter

http://php.net/manual/en/function.random-bytes.php
https://github.com/paragonie/random_compat


https://www.codeigniter.com/user_guide/l...ndom_bytes
https://github.com/bcit-ci/CodeIgniter/b...y.php#L598

https://paragonie.com/blog/2015/07/commo...generators

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