Description:
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On Windows, realpath() expands the directory junction points.
According to an apparently authoritative assesment of pajoye@php.net in the https://bugs.php.net/bug.php?id=72642 , this shouldn't happen.

Test script:
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<?php

$rootdir = substr(getenv('SystemRoot'), 0, 3);
$tmpdir = getenv('TEMP');
shell_exec("mklink /J \"{$rootdir}home\" \"{$rootdir}Users\"");
shell_exec("mklink /J \"{$tmpdir}\\test.dir\" \"{$rootdir}home\\Public\\Desktop\"");
$file = "{$tmpdir}\\test.dir\\desktop.ini";
$rfile1 = realpath($file);
$rfile2 = realpath($rfile1);
printf("orig.file name: %s\n", $file);
printf("realpath(name): %s (%s)\n", $rfile1, $file == $rfile1 ? 'Ok' : 'fail');
printf("THE real name:  %s (%s)\n", $rfile2, $file == $rfile2 ? 'Ok' : 'fail');

rmdir("{$rootdir}home");
rmdir("{$tmpdir}\\test.dir");


Expected result:
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According to pajoye@php.net, expansion shouldn't happen, and all paths must be the same == the original path.

Actual result:
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All paths are different. On each iteration, realpath() only expands a portion of nested junctions.