chown

说明

bool chown ( string filename, mixed user )

尝试将文件 filename 的所有者改成用户 user（由用户名或用户 ID 指定）。只有超级用户可以改变文件的所有者。

如果成功则返回 TRUE，失败则返回 FALSE。

注: 本函数不能作用于远程文件，被检查的文件必须通过服务器的文件系统访问。

注: 当安全模式被激活时，PHP 将检查被操作的文件或者目录是否与正在执行的脚本有相同的 UID（所有者）。

参见 chmod()。

add a note User Contributed Notes

Tayfun Bilsel
12-Jan-2006 12:13


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
23-May-2005 03:38


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));

greg _at_ rhythmicdesign d.o.t com
24-Feb-2004 08:00


<?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.

Richard Esplin
12-Oct-2003 11:49


As far as I can tell, PHP's built in functions will not do a recursive chown or chgrp. But it wouldn't be hard to write a function for this. Here is some starter code based on an example written by John Coggeshall which I found at http://www.coggeshall.org :





<?php


function recurse_chown_chgrp($path2dir, $uid, $gid){


    $dir = new dir($path2dir);


    while(($file = $dir->read()) !== false) {


        if(is_dir($dir->path.$file)) {


            recurse_chown_chgrp($dir->path.$file, $uid, $gid);


        } else {


            chown($file, $uid);


            chgrp($file, $gid);


        }


    }


    $dir->close();


}


?>





I have not tested this code (but I think it will work) because for my current needs, a simple exec("chown -r $user.$group $path"); is sufficient. I would need this code if I were not in control of the contents of these variables because they can be dangerous on the command line.

Klaus Zierer
27-Jun-2003 11:37


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");

martijn at sigterm dot nl
20-Jun-2003 10:28


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).

njs+php at scifi dot squawk dot com
22-Sep-2000 02:28


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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