How to switch web servers in PHPWAMP, using Apache2.2, Apche2.4, Nginx, IIS and other site management, you
can click the menu "Related Settings->>Change php version" 
and then select the required web server, for example, if you want to use Nginx site management,
you can Select any php version with nginx in the interface below to start.
Important note: If you want to use nginx site management, the php version you choose here is irrelevant, because the php version here
is only the version of the default site on the main interface of the software, and you can set other php versions at will in the corresponding site management .
All PHP versions can be switched in the site management, and any 32/64-bit PHP version can also be customized. 
Knowledge expansion:
what is the difference between the PHP version of the main interface and the PHP version of the site management, please check here https://blog.csdn.net/Lccee/article/details/77981230
Detailed graphic tutorials on the management of the three major sites of apache, iis, and nginx https://blog.csdn.net/Lccee/article/details/77982131