Windows 案例问题上的 PHP realpath [英] PHP realpath on Windows Case Issue

问题描述

我的 Windows 服务器上有一个符号链接，它是这样制作的:

I have a symlink on my Windows server which was made like this:

F:\>mkdir link-target
F:\>mklink /D link f:\link-target 

(注意符号链接目标中的小写f:)

在 PHP 中我运行这个:

In PHP I run this:

$dir = realpath('f:\link');
var_dump($dir);

$dir = realpath($dir);
var_dump($dir);

输出:

string 'f:\link-target' (length=14)
string 'F:\link-target' (length=14)

注意第二个真实路径上大小写的变化.

Notice the change in case on the second realpath.

这是错误还是有意为之?解决它的最佳方法是什么?

Is this a bug, or intended? And whats the best way to work around it?

它正在打破这样的案例:

It is breaking a case like this:

function check_link($to, $from) {
    if (realpath($to) !== realpath($from)) {
        ...
    }
}

用于检查$to是否存在，并链接到$from.

Which is used to check $to exists, and is linked to $from.

• PHP 5.4
• Windows 7

我需要在 Windows 和 Linux 上保持一致的行为，并且要解决以下问题:

I need consistent behavior on both Windows and Linux, and have the following work around be its pretty nasty:

if (realpath($from) === false) {
} elseif (realpath($to) === false) {
} else {
    do {
        $to = realpath($to);
    } while (realpath($to) !== false && $to !== realpath($to));
    do {
        $from = realpath($from);
    } while (realpath($from) !== false && $from !== realpath($from));
    if ($to !== $from) {
        ...
    }
}

编辑 2:

经过进一步调查，我注意到在 Windows 上，符号链接仅跟踪 1 级深度:

On furter investigation I have noticed that on Windows symlinks are only followed 1 level deep:

// F:\>mkdir link-target
// F:\>mklink /D link f:\link-target 
// F:\>mklink /D link2 f:\link

$dir = realpath('f:\link2');
var_dump($dir);

$dir = realpath($dir);
var_dump($dir);

$dir = realpath($dir);
var_dump($dir);

// string 'f:\link' (length=7)
// string 'f:\link-target' (length=14)
// string 'F:\link-target' (length=14)

推荐答案

结果

do {
    $to = realpath($to);
} while (realpath($to) !== false && $to !== realpath($to));

是唯一的方法.

https://bugs.php.net/bug.php?id=61933

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