PHP: translate virtual path to physical path

Is it possible to translate a server relative vir开发者_JAVA百科tual path to physical path in PHP?

e.g. if I have a url:

/home/index.php

then find the physical path of index.php somehow from some other script?

You're looking for realpath

$path = 'mydir/index.php';
echo realpath($path);

Prepend $_SERVER["DOCUMENT_ROOT"] to the script path.