php - finding the path to a file residing in the wamp www directory -

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i have file in project folder wampserver www directory , want create path file in php script. not sure right in accomplishing have seen use of "./", "../" , full root directory of "c:/...." foresee situation use of c: restrict usage of path local machine , therefore want use wamp's root www.

to document root read $_server-superglobal.

echo $_server['document_root'];

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