Retrieve WordPress root directory path?

Question

How can I retrieve the path to the root directory in WordPress CMS?

Answer 1

   Please try this for get the url of root file.

First Way:

 $path = get_home_path();
   print "Path: ".$path; 
// Return "Path: /var/www/htdocs/" or

// "Path: /var/www/htdocs/wordpress/" if it is subfolder

Second Way:

And you can also use 

    "ABSPATH"

this constant is define in wordpress config file.