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linkinfo> <lchown
[edit] Last updated: Sat, 12 May 2012

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linkinfo> <lchown
[edit] Last updated: Sat, 12 May 2012
 
add a note add a note User Contributed Notes link
Unsigned 05-Oct-2011 10:25
link() actually does work on Windows XP SP3 running PHP 5.3.8 on an NTFS filesystem, even though the documentation says Vista and later.

The corresponding symlink() does not however.
Anonymous 16-Oct-2009 01:54
to clarify:

in unix/linux:
hardlinks (by this function) cannot go across different filesystems.
softlinks can point anywhere.

in linux, hardlinking to directory is not permited.
albertpeschar at gmail dot com 28-May-2008 08:20
>> Be aware that the filesystem of the target and the link must be the same,
>> otherwise the link will fail! (Linking files over different filesystems doesn't work under Unix).

Using debian sid, 2.6.24-17-generic, that is definitely not true.
Tim McCormack 27-Mar-2008 05:04
As others have noted, the parameter order can seem a little awkward. Here's a mnemonic for remembering the order:

In UNIX, commands go like this:

> command input output

The link command is no different:

> ln infile outfile

...and PHP respects that convention.
Jasper Bekkers 06-Mar-2008 09:08
Due to the acquisition of Winternals by Microsoft, the previous link to junction.exe doesn't work anymore. The file has been moved to http://www.microsoft.com/technet/
sysinternals/FileAndDisk/Junction.mspx

(without the newline)
me at robhaswell dot co dot uk 09-Jan-2008 06:56
For those that find the order of the arguments unclear, here is a more verbose description:

<?php

$source
= "something.ext"; // This is the file that already exists
$dest = "newfile.ext"; // This the filename that you want to link it to

link($source, $dest);
?>
stephane AT baladeauboutdumonde DOT com 06-Aug-2007 11:45
Make link recursively :
<?php
function makeRecusLink($orig, $dest)
{
    if (
is_dir($orig)) {
        if (
substr($orig, -1) != '/') {
           
$orig .= '/';
        }

       
$handle = opendir($orig);

        while (
false !== ($file = readdir($handle))) {
            if (
$file != '.' && $file != '..') {
               
$path = $orig.$file;

                if (
is_file($path)) {
                    @
link($path, $dest.'/'.$file);
                } else if (
is_dir($path)) {
                    @
mkdir($dest.'/'.$file, 0755);                   
                   
makeRecusLink($path, $dest.'/'.$file);
                }
            }
        }
    }
   
   
closedir($handle);
}
?>
root at c-works dot net 05-Jan-2007 01:58
Be aware that the filesystem of the target and the link must be the same, otherwise the link will fail! (Linking files over different filesystems doesn't work under Unix).
Jasper Bekkers 02-Aug-2006 07:16
For a backup utility I needed link-like functionality on a windows system. As it isn't availible on windows, i tried to do it myself with the help of some tools. All you need is junction.exe from sysinternals in your %PATH%.

<?php
if(!function_exists('link')){ // Assume a windows system
   
function link($target, $link){
        if(
is_dir($target)){
           
// junctions link to directories in windows
           
exec("junction $link $target", $lines, $val);
            return
0 == $val;
        }elseif(
is_file($target)){
           
// Hardlinks link to files in windows
           
exec("fsutil hardlink create $link $target", $lines, $val);
            return
0 == $val;
        }
       
        return
false;
    }
}
?>

http://www.sysinternals.com/Utilities/Junction.html
Guilherme Garnier 25-Apr-2006 11:32
I noticed that, differently from Unix ln command, the second parameter canĀ“t be a directory name, i.e., if you want to create a link with the same filename of the target file (obviously on different directories), you must specify the filename on the link parameter.

Example:
Unix ln command:
ln /dir1/file /dir2/   // ok, creates /dir2/file link

PHP link function:
link ("/dir1/file", "/dir2/");   // wrong, gives a "File exists" warning
link ("/dir1/file", "/dir2/file");   // ok, creates /dir2/file link
mmap at upt dot org 15-May-2004 04:28
I think kop is confused regarding the semantics of link's argument order.  The user's comment states that target should not already exist, suggesting that it is the target that is being created.   As with the UNIX hardlink, ln(1), the target is the existing file.  I think kop meant to say php's link() will return an error if the second parameter, the link being created, already exists.

Also, as with the UNIX system call link will fail if the link being created exists on a different filesystem.
kop at meme dot com 25-Sep-2003 02:20
Note that link() will not work if the target already exists, at least as of php 4.1.2.

 
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