chmod
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).
chown
(PHP 4, PHP 5)
chown — Change le propriétaire du fichier
Description
Change le propriétaire du fichier
filename en user.
Seul le super-utilisateur (root) peut changer arbitrairement
le propriétaire d'un fichier.
Liste de paramètres
-
filename -
Chemin vers le fichier.
-
user -
Un nom ou un numéro d'utilisateur.
Valeurs de retour
Cette fonction retourne TRUE en cas de
succès ou FALSE si une erreur survient.
Exemples
Exemple #1 Exemple avec chown()
<?php
// Nom du fichier et nom d'utilisateur à utiliser
$file_name= "foo.php";
$path = "/home/sites/php.net/public_html/sandbox/" . $file_name ;
$user_name = "root";
// Définit l'utilisateur
chown($path, $user_name);
// Vérification du résultat
$stat = stat($path);
print_r(posix_getpwuid($stat['uid']));
?>
L'exemple ci-dessus va afficher quelque chose de similaire à :
Array
(
[name] => root
[passwd] => x
[uid] => 0
[gid] => 0
[gecos] => root
[dir] => /root
[shell] => /bin/bash
)
Notes
Note: Cette fonction ne fonctionne pas avec les fichiers distants, car le fichier utilisé doit être accessible sur le système de fichiers local.
Note: Lorsque le safe-mode est activé, PHP vérifie si le fichier/dossier que vous allez utiliser a le même UID que le script qui est actuellement exécuté.
add a note
User Contributed Notes
chown - [8 notes]
martijn at sigterm dot nl ¶
9 years ago
Klaus Zierer ¶
9 years ago
If you want to chown a symlink, PHP will follow the symlink and change the target file.
If you want to chown the symlink, you have to use shell_exec("/bin/chown user.group symlink");
njs+php at scifi dot squawk dot com ¶
12 years ago
If you allow sudo execution for chmod by "nobody" (www, webdaemon, httpd, whatever user php is running under)in this manner, it had better be a system on which the owner is able to be root and no one else can run code, else your whole system is compromised. Someone could change the mode of /etc/passwd or the shadow password file.
Other system commands (sudo mount) and so forth are similar.
Mikevac at yahoo dot com ¶
5 years ago
I've only tested this on Solaris 10 so your mileage may vary.
To allow the apache daemon to change file ownership without being root, add the following line to /etc/system:
set rstchown=0
Reboot the server.
There are security concerns doing this as this modification allows any user to change ownership of their files to anyone else.
greg _at_ rhythmicdesign d.o.t com ¶
9 years ago
<?php
function recurse_chown_chgrp($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.
rickard at 0x539 dot se ¶
3 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.
Tayfun Bilsel ¶
7 years ago
Simple usage of the chown:
<?php
$file_name= "test";
$path = "/var/www/html/test/" . $file_name ;
$user_name = "root";
chown($path, $user_name);
?>
Jens Vieler ¶
7 years ago
for some reason i was searching for chown() with an "on this mashine"-unknown userid and found martijn's hint very interesting. the main problem is, that if the numerical uid is used within a variable, it is checked against the /etc/passwd and returns "unknown user". a little note:
use intval(), not inval()! so all in all it is:
chown($path_to_dir,intval($uidnumber));