Subdomain Wildcard is a great system for create a site, blog, and etc without add subdomain manual in your server. Just type anthing.example.com

If you get project for develop site like news site with multiple canal, you can put this sistem in there for fastest your time without coding.

Example: domain: example.com canal: news, inet, sport, health

Your canal has own subdomain (for desktop site) and a directory (for mobile site)

Url: https://m.example.com/news

array(
["subdomain"] => string(4) "news"
)

Url: https://news.example.com/index

array(
["subdomain"] => string(4) "news"
)