This one will put both the "www" and "file" path into an easy to transport array.
<?php
// build the www path:
$me = $_SERVER['PHP_SELF'];
$Apathweb = explode("/", $me);
$myFileName = array_pop($Apathweb);
$pathweb = implode("/", $Apathweb);
$myURL = "http://".$_SERVER['HTTP_HOST'].$pathweb."/".$myFileName;
$PAGE_BASE['www'] = $myURL;
// build the file path:
strstr( PHP_OS, "WIN") ? $strPathSeparator = "\\" : $strPathSeparator = "/";
$pathfile = getcwd ();
$PAGE_BASE['physical'] = $pathfile.$strPathSeparator.$myFileName;
// this is so you can verify the results:
$www = $PAGE_BASE['www'];
$physical = $PAGE_BASE['physical'];
echo "$physical<p>";
echo "$www<p>";
?>
The following will return something like:
Windows:
F:\dev\Inetpub\wwwroot\somedirectory\index.php
http://devserver/somedirectory/index.php
Unix:
/home/somepathto/gieson.com/webroot/index.php
http://www.gieson.com/index.php