Cryptographically Secure Pseudorandom Number Generator
I'll keep this brief. Go read The PHP Security Platinum Standard: Raising the Bar with CMS Airship for the release announcement.
If you're looking for the place to sign up for a supplier account to make your own extensions, you want https://airship.paragonie.com instead. (Warning: kind of ugly, need to update the CSS when I get a chance.)
Otherwise, feel free to create an account here and enjoy your stay.