SunshinePHP Developer Conference 2015

chown

(PHP 4, PHP 5)

chownModifica o dono do arquivo

Descrição

bool chown ( string $arquivo , mixed $usuario )

Tenta modificar o dono do arquivo para o usuario. Somente o superusuário pode modificar o dono de um arquivo.

Parâmetros

filename

Caminho para o arquivo.

user

O nome do usuário ou número.

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Notas

Nota: Esta função não trabalha com arquivos remotos, de forma que o arquivo a ser examinado precisa ser acessível pelo sistema de arquivos do servidor.

Nota: Quando o safe-mode está ativo, o PHP verifica se os arquivo(s) ou diretórios que estão usados na operação tem o mesmo UID (proprietário) do script que está sendo executado.

Veja Também

  • chmod() - Modifica as permissões do arquivo

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User Contributed Notes 7 notes

up
4
njs+php at scifi dot squawk dot com
14 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.
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2
Klaus Zierer
11 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");
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1
greg _at_ rhythmicdesign d.o.t com
10 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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0
Mikevac at yahoo dot com
6 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.
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-1
Tayfun Bilsel
8 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);

?>
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-1
martijn at sigterm dot nl
11 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).
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-3
rickard at 0x539 dot se
5 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.
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