Symlinks are broken when extracting tar archive

Description

I have a TAR archive that contains symlink(s).

mkdir test
cd test
echo "file1" > file1
ln -s file1 file2
mkdir a
cd a
echo "file3" > file3
cd ..
ln -s a b
cd ..
tar -cf test.tar test

Extracting using tar works fine:

rm -r test
tar -xvf test.tar
ls -lah test

total 24K
drwxr-xr-x   3 michal michal 4.0K Sep 19 09:36 .
drwxr-xr-x 104 michal users   12K Sep 19 09:37 ..
drwxr-xr-x   2 michal michal 4.0K Sep 19 09:36 a
lrwxrwxrwx   1 michal michal    1 Sep 19 09:36 b -> a
-rw-r--r--   1 michal michal    6 Sep 19 09:36 file1
lrwxrwxrwx   1 michal michal    5 Sep 19 09:36 file2 -> file1

The following code extracts the archive using php:

<?php

$tar = '/home/michal/test.tar';
$targetDir = '/tmp/phpissue';

$phar = new \PharData($tar);
$phar->extractTo($targetDir, null, true);

Resulted in this:

ls -lah /tmp/phpissue/test/
total 16K
drwxr-xr-x 3 michal michal 4.0K Sep 19 09:42 .
drwxr-xr-x 3 michal michal 4.0K Sep 19 09:42 ..
drwxr-xr-x 2 michal michal 4.0K Sep 19 09:42 a
-rwxrwxrwx 1 michal michal    0 Sep 19 09:42 b
-rw-r--r-- 1 michal michal    6 Sep 19 09:42 file1
-rwxrwxrwx 1 michal michal    0 Sep 19 09:42 file2

The directory "b" is just an empty file, also the file2 is just en empty file. Both were symlinks.

I expect that those symlinks are correctly extracted.

PHP Version

Tested on php8.2+ (all with the same result):

PHP 8.4.12 (cli) (built: Sep  7 2025 14:06:59) (NTS)
Copyright (c) The PHP Group
Built by Debian
Zend Engine v4.4.12, Copyright (c) Zend Technologies
    with Zend OPcache v8.4.12, Copyright (c), by Zend Technologies

PHP 8.3.25 (cli) (built: Sep  7 2025 14:03:54) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.25, Copyright (c) Zend Technologies
    with Zend OPcache v8.3.25, Copyright (c), by Zend Technologies

PHP 8.2.29 (cli) (built: Sep  7 2025 14:06:52) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.29, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.29, Copyright (c), by Zend Technologies

Operating System

Debian Bookworm

从 PharData::extractTo 入口点开始，跟踪 TAR 符号链接条目在提取过程中的处理方式。在 PHP 8.2+ 上复现所提供的归档案例，并验证 file2 和 b 是分别指向 file1 和 a 的符号链接，而不是空的普通文件。