
HHVM 3.21 features a number of improvements for PHP 7 code compatibility, void is now supported as a return type in PHP7 mode, support for the libsodium extension for modern crypto as being introduced in PHP 7.2, improved IDE auto-completion support, and other features and fixes.
PHP/Hack developers interested in more details on HHVM 3.21 can find all the useful information via HHVM.com.
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