I received the following warning, when I tried to access a file from gitub in PHP script:

> 
> Warning: DOMDocument::load() [domdocument.load]:
>  Unable to find the wrapper "https" - did you forget to enable it when you
>  configured PHP? 
>  in C:\xampp\htdocs\plaoul\text\gittest.php on line 13`
> 
> 
> 

Can you explain what "wrapper" is, what needs to be configured, and generally what's happening?