It is announced by the PHP development team that PHP 7.4 is now available which mark the fourth feature update to the PHP 7 series. There are several improvement, new features and deprecation have been made into this new PHP version such as Typed Properties, Arrow Functions, Limited Return Type Covariance & Argument Type Contravariance, Unpacking Inside Arrays, Numeric Literal Seperator, Weak References, Allow Exception from __toString(), Opcache Preloading and Extensions Removed from the Core.
You can download the source of PHP 7.4 from here and for Windows binaries can be found here, PHP for Windows. Find out more by visiting the official site at https://www.php.net/.