It is required to install the PHP on your Windows web server to run the PHP Website.
Before we install PHP 7, we will install Visual C++ Redistributable for Visual Studio 2015 from this URL: https://www.microsoft.com/en-us/download/details.aspx?id=48145
1. Download the PHP 7 directly from the URL https://windows.php.net/download/
2. Extract the PHP files to the path C:\Program Files\php. If you don't have a PHP folder inside Programme Files, you can create it manually.
3. Rename the file php.ini-production to the php.ini.
4. Go to IIS >> PHP Manager and select Change PHP Version to 7.
5. Add a phpinfo page to the Document root of your website.
6. Browser the same page, and it should show php7.