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).
(PHP 4, PHP 5, PHP 7, PHP 8)
chown — Cambia el propietario del fichero
Intenta cambiar el propietario del fichero filename
por el usuario user
. Sólo el superusuario puede cambiar el
propietario de un fichero.
filename
La ruta hacia el fichero.
user
Un nombre o número de usuario.
Devuelve true
en caso de éxito o false
en caso de error.
Ejemplo #1 Uso sencillo de chown()
<?php
// El nombre de fichero y el nombre de usuario a emplear
$nombre_fichero= "foo.php";
$ruta = "/home/sites/php.net/public_html/sandbox/" . $nombre_fichero ;
$nombre_usuario = "root";
// Establecer el usuario
chown($ruta, $nombre_usuario);
// Verificar el resultado
$stat = stat($ruta);
print_r(posix_getpwuid($stat['uid']));
?>
El resultado del ejemplo sería algo similar a:
Array ( [name] => root [passwd] => x [uid] => 0 [gid] => 0 [gecos] => root [dir] => /root [shell] => /bin/bash )
Nota: Esta función no funcionará en ficheros remotos ya que el fichero debe ser accesible vía el sistema de ficheros del servidor para poder ser examinado.
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).
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.
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");
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.
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.
Simple usage of the chown:
<?php
$file_name= "test";
$path = "/var/www/html/test/" . $file_name ;
$user_name = "root";
chown($path, $user_name);
?>
<?php
function recurse_chown_chgrp($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.