Help me about php

Give me a Web page explaining the "" [ ] mark I often see in plugins

 

Double-quotes refer to string in which you can use variables. And the brackets refer to an array

 

@TheClimbing answered for you already, but there is a website where you can find this information. Glorious https://secure.php.net/manual/en/.

If you don't know where to look for it, then Google can also help you.
Search query: "php (question)", i.e. "php [] meaning".

 

I can't find you can be more specific

 

Oh thanks