linkinfo

lchown

[edit] Last updated: Fri, 23 Mar 2012

link

(PHP 4, PHP 5)

link — Sabit bir bağ oluşturur

Açıklama

bool link ( string $bağ , string $hedef )

link() işlevi sabit bağ oluşturur.

Değiştirgeler

bağ: Bağ dosyası ismi.
hedef: Bağın hedefi.

Dönen Değerler

Başarı durumunda TRUE, başarısızlık durumunda FALSE döner.

Notlar

Bilginize: Sadece Windows için: Bu işlev PHP'nin yükseltgenmiş kipte veya UAC iptal edilmiş durumdayken çalıştırılmasını gerektirir.

Sürüm Bilgisi

Sürüm:	Açıklama
5.3.0	İşlev Windows platformlarında da (Vista, Server 2008 ve üstü) kullanılabilir oldu.

Örnekler

Örnek 1 - Basit bir sabit bağ oluşturma örneği


<?php

$hedef = 'mevcut.uzt'; // Bu dosya mevcut.
$bağ = 'yeni.uzt';     // Bu da bağ dosyamız olsun.

link($hedef, $bağ);
?>

Notlar

Bilginize: Dosyaların sunucunun dosya sistemi üzerinden erişilebilir olması gerektiğinden bu işlev uzak dosyalar üzerinde çalışmayacaktır.

Ayrıca Bakınız

symlink() - Bir sembolik bağ oluşturur
readlink() - Bir sembolik bağın hedefi ile döner
linkinfo() - Bir bağ hakkında bilgi verir

linkinfo

lchown

[edit] Last updated: Fri, 23 Mar 2012

add a note User Contributed Notes link

Unsigned 05-Oct-2011 04:25


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 15-Oct-2009 07:54


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 02:20


>> 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 11:04


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 02:08


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 11:56


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 05:45


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 04-Jan-2007 06:58


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 01:16


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 05:32


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 14-May-2004 10:28


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 24-Sep-2003 08:20


Note that link() will not work if the target already exists, at least as of php 4.1.2.

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