Let's Make 2017 the Year of Simply Secure PHP Cryptography
https://paragonie.com/blog/2017/01/let-s-make-2017-year-simply-secure-php-cryptography [paragonie.com]
2017-01-12 16:49
Although adding libsodium to the newest version of PHP will significantly improve the software written in 2018 and beyond, it doesn’t do a lot of good for the software that powers a third of all websites on the Internet today.
And thus, a polyfill backport.