chown

(PHP 4, PHP 5, PHP 7, PHP 8)

chownCambia il proprietario del file

Descrizione

chown(string $filename, mixed $user): bool

Tenta di cambiare il proprietario del file filename nell'utente user. Solo il superuser può cambiare il proprietario di un file.

Elenco dei parametri

filename

Percorso del file.

user

Un nome utente o un numero.

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Esempi

Example #1 Semplice utilizzo di chown()

<?php

// Nome file e nome utente da utilizzare
$file_name"foo.php";
$path "/home/sites/php.net/public_html/sandbox/" $file_name ;
$user_name "root";

// Imposta l'utente
chown($path$user_name);

// Controlla il risultato
$stat stat($path);
print_r(posix_getpwuid($stat['uid']));

?>

Il precedente esempio visualizzerà qualcosa simile a:

Array
(
    [name] => root
    [passwd] => x
    [uid] => 0
    [gid] => 0
    [gecos] => root
    [dir] => /root
    [shell] => /bin/bash
)

Note

Nota: Questa funzione non opererà su file remoti perché il file che deve essere esaminato deve essere accessibile attraverso il filesysmte del server.

Nota: Su Windows, questa funzione fallisce silenziosamente se applicata su un file normale.

Vedere anche:

  • chmod() - Cambia le impostazioni del file
  • chgrp() - Cambia il gruppo del file

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User Contributed Notes 7 notes

up
5
martijn at sigterm dot nl
19 years ago
If chown is filled with a variable (  chown ("myfile", $uid) the uid will be looked up through pwget_uid.

So if you need to set a non existing uid use inval($uid).
up
0
Mikevac at yahoo dot com
14 years ago
I've only tested this on Solaris 10 so your mileage may vary.

To allow the apache daemon to change file ownership without being root, add the following line to /etc/system:

set rstchown=0

Reboot the server.

There are security concerns doing this as this modification allows any user to change ownership of their files to anyone else.
up
0
Klaus Zierer
19 years ago
If you want to chown a symlink, PHP will follow the symlink and change the target file.

If you want to chown the symlink, you have to use shell_exec("/bin/chown user.group symlink");
up
0
njs+php at scifi dot squawk dot com
22 years ago
If you allow sudo execution for chmod by "nobody" (www, webdaemon, httpd, whatever user php is running under)in this manner, it had better be a system on which the owner is able to be root and no one else can run code, else your whole system is compromised.  Someone could change the mode of /etc/passwd or the shadow password file.

Other system commands (sudo mount) and so forth are similar.
up
-7
rickard at 0x539 dot se
13 years ago
For most modern Linux systems your apache user should not be run as root, and in order to change the ownership of a file or directory, you need to be root. To get around this problem you can use sudo, but be careful with what permissions you give. Here is an example which is working for me:

www-data        ALL = NOPASSWD: /bin/chown 1[1-9][0-9][0-9]\:1[1-9][0-9][0-9] /home/www/[a-zA-Z0-9]*

This allows the apache server to change ownership of files in /home/www with name containing a-z, A-Z or numbers (note: no subdirectories). The only valid input of userid is a four digit numeric id, between 1100 and 1999.

Hope this helps.
up
-9
Tayfun Bilsel
16 years ago
Simple usage of the chown:

<?php

$file_name
= "test";
$path = "/var/www/html/test/" . $file_name ;

$user_name = "root";

chown($path, $user_name);

?>
up
-10
greg _at_ rhythmicdesign d.o.t com
18 years ago
<?php
function recurse_chown_chgrp($mypath, $uid, $gid)
{
   
$d = opendir ($mypath) ;
    while((
$file = readdir($d)) !== false) {
        if (
$file != "." && $file != "..") {

           
$typepath = $mypath . "/" . $file ;

           
//print $typepath. " : " . filetype ($typepath). "<BR>" ;
           
if (filetype ($typepath) == 'dir') {
               
recurse_chown_chgrp ($typepath, $uid, $gid);
            }

           
chown($typepath, $uid);
           
chgrp($typepath, $gid);

        }
    }

}

recurse_chown_chgrp ("uploads", "unsider", "unsider") ;
?>

for older versions.. unfortunately, it seems I do not have permission to perform these functions.
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