Best coding language?

its different for purpose, like for tiny things or web things i prefer php, like i had to wrote a premium downloader for 1fichier because the uploader protected the 1000 links with a password jdownloader cant handle.

1. smal things on linux or web php
2. interactive things i use php and javascript with react
3. for system things like using dlls i use c# with mono under linux

its very hard every time when i have to change from php to another lang