---|:---:|---
[`openssl`](http://php.net/manual/en/book.openssl.php) | All | OpenSSL, HTTPS
[`php-mbstring`](http://php.net/manual/en/book.mbstring.php) | CentOS, Fedora, RHEL, Windows, some hosting providers | multibyte (Unicode) string support
---|:---:|---
[`openssl`](http://php.net/manual/en/book.openssl.php) | All | OpenSSL, HTTPS
[`php-mbstring`](http://php.net/manual/en/book.mbstring.php) | CentOS, Fedora, RHEL, Windows, some hosting providers | multibyte (Unicode) string support