lchown
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.
link
(PHP 4, PHP 5)
link — Crée un lien
Description
bool link
( string
$target
, string $link
)link() crée un lien.
Liste de paramètres
-
target -
La cible du lien.
-
link -
Le nom du lien.
Valeurs de retour
Cette fonction retourne TRUE en cas de
succès ou FALSE si une erreur survient.
Notes
Note: Windows uniquement : cette fonction requiert un niveau de fonctionnement avec des droits élevés, ou bien la désactivation de UAC.
Historique
| Version | Description |
|---|---|
| 5.3.0 | Cette fonction est maintenant disponible sous Windows (Vista, Server 2008 ou plus récent). |
Exemples
Exemple #1 Création d'un lien
<?php
$target = 'source.ext'; // Ceci est le fichier qui existe actuellement
$link = 'newfile.ext'; // Ceci sera le nom du fichier que vous voulez lier
link($target, $link);
?>
Notes
Note: Cette fonction ne fonctionne pas avec les fichiers distants, car le fichier utilisé doit être accessible sur le système de fichiers local.
Voir aussi
- symlink() - Crée un lien symbolique
- readlink() - Renvoie le contenu d'un lien symbolique
- linkinfo() - Renvoie les informations d'un lien
add a note
User Contributed Notes
link
Unsigned
05-Oct-2011 10:25
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 can´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.