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Super Global Variables in PHP, known as the Superglobals, are predefined variables witch have a scope of global. Thus, you can use any of them you want in anywhere in your PHP code.

There is a list of Superglobals：

1. $_SERVER['Key']：$_SERVER is a array, so it contain keys to hold several value regarding some information such as path, location, header. Following keys are using with $_SERVER.
   • DOCUMENT_ROOT：hold the information of the path of current file. If you creat a file located in the C:/xampp/htdocs path, and input <?ph echo $_SERVER['DOCUMENT_root']; ?>, save this file by .php extension. Then you try to run this file, there will be a output as C:/xampp/htdocs in your browser.
     

PS：Both of Superglobals and the keys of them must be written by uppercase. Because in PHP, Variables are case sensitive.

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