[Mellnik]

Use this in your Pawn script: https://sampwiki.blast.hk/wiki/SHA256_PassHash
Use this in your PHP script: http://php.net/manual/en/function.hash.php

Learn more about salts here http://php.net/manual/en/faq.passwords.php

The best solution would be to use plugins which support bcrypt or PBKDF2.