How to specify path in php

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PHP

i am trying to open a php project which is in C:\xampp\htdocs\unigoa.indowordnet

thr z some problem when i am writing this code
<?php
$path=$_SERVER['DOCUMENT_ROOT']."C:\xampp\htdocs\unigoa.indowordnet";
?>

Error: Do not access superglobal $SERVER array directlty
use some filtering function instead.( eg filter_input())


please help me. i m learning php.