chown

chgrp

Last updated: Fri, 05 Sep 2008

chmod

(PHP 4, PHP 5)

chmod — Changes file mode

Description

bool chmod ( string $filename , int $mode )

Attempts to change the mode of the specified file to that given in mode .

Parameters

filename

Path to the file.

mode

Note that mode is not automatically assumed to be an octal value, so strings (such as "g+w") will not work properly. To ensure the expected operation, you need to prefix mode with a zero (0):


<?php
chmod("/somedir/somefile", 755);   // decimal; probably incorrect
chmod("/somedir/somefile", "u+rwx,go+rx"); // string; incorrect
chmod("/somedir/somefile", 0755);  // octal; correct value of mode
?>

The mode parameter consists of three octal number components specifying access restrictions for the owner, the user group in which the owner is in, and to everybody else in this order. One component can be computed by adding up the needed permissions for that target user base. Number 1 means that you grant execute rights, number 2 means that you make the file writeable, number 4 means that you make the file readable. Add up these numbers to specify needed rights. You can also read more about modes on Unix systems with 'man 1 chmod' and 'man 2 chmod'.


<?php
// Read and write for owner, nothing for everybody else
chmod("/somedir/somefile", 0600);

// Read and write for owner, read for everybody else
chmod("/somedir/somefile", 0644);

// Everything for owner, read and execute for others
chmod("/somedir/somefile", 0755);

// Everything for owner, read and execute for owner's group
chmod("/somedir/somefile", 0750);
?>

Return Values

Returns TRUE on success or FALSE on failure.

Notes

Note: The current user is the user under which PHP runs. It is probably not the same user you use for normal shell or FTP access. The mode can be changed only by user who owns the file on most systems.

Note: This function will not work on remote files as the file to be examined must be accessible via the server's filesystem.

Note: When safe mode is enabled, PHP checks whether the files or directories you are about to operate on have the same UID (owner) as the script that is being executed. In addition, you cannot set the SUID, SGID and sticky bits.


I use the code of haasje@welmers.net, but have a lite alteration. (linux symlink)



<?php

function chmod_R($path, $filemode) {

    if (!is_dir($path))

        return chmod($path, $filemode);



    $dh = opendir($path);

    while ($file = readdir($dh)) {

        if($file != '.' && $file != '..') {

            $fullpath = $path.'/'.$file;

            if(is_link($fullpath))

                return FALSE;

            elseif(!is_dir($fullpath))

                if (!chmod($fullpath, $filemode))

                    return FALSE;

            elseif(!chmod_R($fullpath, $filemode))

                return FALSE;

        }

    }



    closedir($dh);



    if(chmod($path, $filemode))

        return TRUE;

    else

        return FALSE;

}

?>

thanks alls

imurnane at internode dot on dot net
22-Jun-2008 01:52


Just stumbled accross this, to create a 777 directory..

mkdir ("test", 0410);

chmod ("test", 0777);



The created folder is 777 insted of 755!

paul maybe at squirrel mail org
24-Apr-2008 07:09


Note that info at rvgate dot nl's chmodnum function produces INCORRECT results.  The resutls are base-10 numbers that only LOOK like they are octal numbers.  The function also ignores setuid, setgid and sticky bits, and will produce incorrect numbers if such a file is encountered.  Instead, this brute-force code works.  Maybe there is something more slick, but this isn't too CPU-intensive (note that it assumes you've error-checked that you indeed have a 10-character string!):



      $permissions = 'drwxr-xr-x';  // or whatever

      $mode = 0;



      if ($permissions[1] == 'r') $mode += 0400;

      if ($permissions[2] == 'w') $mode += 0200;

      if ($permissions[3] == 'x') $mode += 0100;

      else if ($permissions[3] == 's') $mode += 04100;

      else if ($permissions[3] == 'S') $mode += 04000;



      if ($permissions[4] == 'r') $mode += 040;

      if ($permissions[5] == 'w') $mode += 020;

      if ($permissions[6] == 'x') $mode += 010;

      else if ($permissions[6] == 's') $mode += 02010;

      else if ($permissions[6] == 'S') $mode += 02000;



      if ($permissions[7] == 'r') $mode += 04;

      if ($permissions[8] == 'w') $mode += 02;

      if ($permissions[9] == 'x') $mode += 01;

      else if ($permissions[9] == 't') $mode += 01001;

      else if ($permissions[9] == 'T') $mode += 01000;



      printf('Mode is %d decimal and %o octal', $mode, $mode);

zual__ at gogo dot mn
31-Oct-2007 07:53


greate ftp newfolder=dir;

chmod --dir change 777;



<?php

$ftp_server='server';

$conn_id = ftp_connect("$ftp_server");

ftp_login($conn_id, user, password);

ftp_mkdir($conn_id, dir/dir);

ftp_site($conn_id, 'CHMOD 777, dir/dir');

ftp_close($conn_id);

?>

til_roque at yahoo dot com
11-Oct-2007 10:03


Problem:

you are trying to circumvent SAFE_MODE setting that prevents you from using chmod() on files you uploaded via a regular ftp client, because php may run as user 'nobody', which is not the user from your ftp session.

using ini_set() won't work

using ftp_chmod() won't work either



Solution:

copy file to some temorary directory. 

delete original file altogether. 

copy temporary file back to original location. 

do the chmod()

mmj048 at gmail dot com
05-Oct-2007 10:56


If you want to use a string for the second parameter, including user input, you MUST use octdec.



http://www.php.net/octdec

martin at aarhof dot eu
17-Aug-2007 09:15


Just for those peoples can't remeber the codes 777 and so on I just created a small class :-)



<?php



class Chmod

{

    

    private $dir;

    private $modes = array('owner' => 0 , 'group' => 0 , 'public' => 0);

    

    public function setOwnermodes($read,$write,$execute) {

        $this->modes['owner'] = $this->setMode($read,$write,$execute);

    }

    

    public function setGroupmodes($read,$write,$execute) {

        $this->modes['group'] = $this->setMode($read,$write,$execute);

    }



    public function setPublicmodes($read,$write,$execute) {

        $this->modes['public'] = $this->setMode($read,$write,$execute);

    }

    

    public function getMode() {

        return 0 . $this->modes['owner'] . $this->modes['group'] . $this->modes['public'];

    }

    

    private function setMode($r,$w,$e) {

        $mode = 0;

        if($r) $mode+=4;

        if($w) $mode+=2;

        if($e) $mode+=1;

        return $mode;

    }



    

}



$test = new Chmod;

$test->setOwnermodes(true,true,true);

$test->setGroupmodes(true,true,true);

$test->setPublicmodes(true,true,true);

chmod($dir , $test->getMode());

// chmods $dir to 0777

?>

Ambriel_Angel at www dot ambriels dot net/entry
25-Mar-2007 09:00


<?php


error_reporting(E_ERROR | E_PARSE);


/* Makes is so Directories are not browseable to the public,


removing only the Public = Read permission, while leaving 


the other chmod permissions for the file in tact.





If you have exectue already on, and read off, public viewers will only


be able to view files through links, but not browse


around to see what's inside of directories and see what


you've got laying around. */


//-------------------------------------------------------


// Get file mode


// Get file permissions supported by chmod


function getmod($filename) {


   $val = 0;


   $perms = fileperms($filename);


   // Owner; User


   $val += (($perms & 0x0100) ? 0x0100 : 0x0000); //Read


   $val += (($perms & 0x0080) ? 0x0080 : 0x0000); //Write


   $val += (($perms & 0x0040) ? 0x0040 : 0x0000); //Execute


 


   // Group


   $val += (($perms & 0x0020) ? 0x0020 : 0x0000); //Read


   $val += (($perms & 0x0010) ? 0x0010 : 0x0000); //Write


   $val += (($perms & 0x0008) ? 0x0008 : 0x0000); //Execute


 


   // Global; World


   $val += (($perms & 0x0004) ? 0x0004 : 0x0000); //Read


   $val += (($perms & 0x0002) ? 0x0002 : 0x0000); //Write


   $val += (($perms & 0x0001) ? 0x0001 : 0x0000); //Execute





   // Misc


   $val += (($perms & 0x40000) ? 0x40000 : 0x0000); //temporary file (01000000)


   $val += (($perms & 0x80000) ? 0x80000 : 0x0000); //compressed file (02000000)


   $val += (($perms & 0x100000) ? 0x100000 : 0x0000); //sparse file (04000000)


   $val += (($perms & 0x0800) ? 0x0800 : 0x0000); //Hidden file (setuid bit) (04000)


   $val += (($perms & 0x0400) ? 0x0400 : 0x0000); //System file (setgid bit) (02000)


   $val += (($perms & 0x0200) ? 0x0200 : 0x0000); //Archive bit (sticky bit) (01000)





   return $val;


}





//-------------------------------------------------------


// Find out if file has mode


function hasmod($perms, $permission) {





# User Read = 0400 (256), Write = 0200 (128), Execute = 0100 (64)


# Group Read = 0040 (32), Write = 0020 (16), Execute = 0010 (8)


# Public Read = 0004 (4), Write = 0002 (2), Execute = 0001 (1)





    return (($perms & $permission) == $permission);


}





//-------------------------------------------------------


// Take the read option off of all the subdirectories of the included path


function pathlock($dir, $listall = false, $testrun = true) {


   echo "START @ " . date("F j, Y, h:i:s A") . "<br><br>";


   echo ($testrun ? '**Test Run Activated (no changes will be made).**<br><br>' : '**Live Run Activated.**<br><br>');


   echo $dir . " is our directory.<br><br>\n";


   echo "[...IN PROGRESS...]<br><br>";





   $file_list = '';


   $stack[] = $dir;


  


   while ($stack) {


      $current_dir = array_pop($stack);


      if ($dh = opendir($current_dir)) {


          while (($file = readdir($dh)) !== false) {


              if ($file !== '.' AND $file !== '..') {


                  $current_file = "{$current_dir}/{$file}";


               if (is_dir($current_file)) {


                      // BEG ADD PATH    


                   $mode = getmod($current_file);    //Get the mode


                      $HasPubRead = hasmod($mode,4);


                   if ($HasPubRead || $listall) {    // Can the public read this dir?


                  //======================================


                    $ch = true;


                  $take = 0;


                       // Change the mode:


                     if ($HasPubRead) {


                          $take = 4;         // Value for Public Read. 4 is the same in octal and decimal.


                          if (!$testrun) {


                              $ch = chmod($current_file, $mode-$take); 


                          }


                      } 





                    echo $current_file . ",current=" . decoct($mode) . 


                        (($mode!==$mode-$take) ? ",new=" . decoct($mode-$take) : '') .


                        ($ch ? '' : ',FAILED') . "<br>\n";


                   } // end if hasmod


                   // END ADD PATH                           


                      $stack[] = $current_file;


                  } // if if_dir


              } //if ($file !== '.' AND $file !== '..')


          } //while (($file = readdir($dh)) !== false)


      } //if ($dh = opendir($current_dir))


} // while ($stack)





    echo "<br>COMPLETE @ " . date("F j, Y, h:i:s A") . "<br>\n";


return;


   //return $path_list;


} // end function





//-------------------------------------------------------


    //listall Show all folders, even one's we're not going to process?


    //testrun Do a test run without making any changes


    pathlock($_SERVER["DOCUMENT_ROOT"],false,true); // listall?=false, testrun?=true





?>

redeyeleader
10-Feb-2007 11:05


Here's a version that works with PHP 5.x - I use this to watermark images on a shared server. 



<?php

// Connect to the FTP to chmod the file via FTP



$ftpUserName = 'username';

$ftpUserPass = 'userpass';

$ftpServer = 'ftp.example.com';



  $ftpConn = ftp_connect($ftpServer);

  

  if (!$ftpConn) {

    die("Unable to connect to $ftpServer");

  }



if (@ftp_login($conn_id, $ftpUserName, $ftpUserPass)) {

   echo "Connected as $ftpUserName @ $ftpServer";

} 

else {

   echo "Couldn't connect as $ftpUserName";

   ftp_close($ftpConn);

   die("Closed connection to $ftpServer");

}



//Now change permissions to 666 or whatever you need 



echo ftp_chmod($ftpConn, 0666, $ftpFilename) ? "CHMOD successful!" : 'Error';



// do what you need here



//Now change permissions back to 644 or whatever 

echo ftp_chmod($ftpConn, 0644, $ftpFilename) ? "CHMOD successful!" : 'Error';



// Close the connection

ftp_close($conn_id);

?>

hodgman at ali dot com dot au
18-Jan-2007 12:06


My PHP script refused to delete read-only files (which is probably a good thing), but I couldnt find out how to fix this on windows.



The solution is simple, i just replaced 

<?php @unlink( $entry ); ?>

with:

<?php 

                @chmod( $entry, 0777 );

                @unlink( $entry );

?>



chmod isnt supposed to work on windows, but 0777 seems to clear the read only flag, and 0444 seems to set the read only flag.

info at web-in-time dot eu
05-Jan-2007 04:11


As you might have noticed there is a minor bug in webmaster at danopia dot 5gigs dot com's code:



You have to set $ftp_root variable outside the function chmod_open() and have to set it as global within the chmod_file() function.



With these patches the code really works fine. THX!



Ben

webmaster at danopia dot 5gigs dot com
03-Jan-2007 09:20


Thanks for your code, "imoldgreg at o2 dot co dot uk". I am using it for an instalation script that has to CHMOD a bunch of files. I have found it faster to use the same connectino for each, as shown below.



<?php



// Thanks to "imoldgreg at o2 dot co dot uk" for the base 'CHMOD via FTP' script.



function chmod_open()

{

    // Use your own FTP info

    $ftp_user_name = 'chmod@XXXXXXXXX.com';

    $ftp_user_pass = 'XXXXXXXXXX';

    $ftp_root = '/';

    $ftp_server = 'localhost';

    $conn_id = ftp_connect($ftp_server);

    $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

    return $conn_id;

}



function chmod_file($conn_id, $permissions, $path)

{

    if (ftp_site($conn_id, 'CHMOD ' . $permissions . ' ' . $ftp_root . $path) !== false)

    {

        return TRUE;

    }

    else

    {

        return FALSE;

    }

}



function chmod_close($conn_id)

{

    ftp_close($conn_id);

}



// CHMOD the required setup files



// Connect to the FTP

$conn_id = chmod_open();



// CHMOD each file and echo the results

echo chmod_file($conn_id, 777, 'master/cache/') ? 'CHMODed successfully!' : 'Error';

echo chmod_file($conn_id, 777, 'master/files/') ? 'CHMODed successfully!' : 'Error';

echo chmod_file($conn_id, 777, 'master/store/') ? 'CHMODed successfully!' : 'Error';

echo chmod_file($conn_id, 766, 'master/config.php') ? 'CHMODed successfully!' : 'Error';

echo chmod_file($conn_id, 777, 'master/images/avatars/upload/') ? 'CHMODed successfully!' : 'Error';



// Close the connection

chmod_close($conn_id);



?>



Here, the same FTP connection is used for each CHMOD command, making the execute time lower. This is essential for me, since my script is also copying a bunch of files.

imoldgreg at o2 dot co dot uk
01-Dec-2006 08:32


an update to 'neil at 11 out of 10's code for changing mode using FTP.



changes: proper array added within the function (better for those of us who only need to connect to one ftp server) so only the mode and directory name need to be passed.



the octal added, for completeness and predictable stability.



function changemode($xcite)

{

$ftp_details = array(

ftp_user_name => 'username', 

ftp_user_pass => 'password', 

ftp_user_root => '/public_html/', 

ftp_server => 'ftp.something.org' 

);



$path = "public";

$mod = intval($xcite, 8);



   // extract ftp details (array keys as variable names)

   extract ($ftp_details);

   

   // set up basic connection

   $conn_id = ftp_connect($ftp_server);

   

   // login with username and password

   $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

   

   // try to chmod $path directory

   if (ftp_site($conn_id, 'CHMOD '.$mod.' '.$ftp_root.$path) !== false) {

       $success=TRUE;

   } 

   else {

       $success=FALSE;

   }



   // close the connection

   ftp_close($conn_id);

    return $success;

}



then call it where required, an example:



changemode(777, directory);

            

if (@copy("$tempname", "$fullfilename")) $done = "yes";



changemode(755, directory);



for those of you, like me, who were looking for a way to make an 'un-hackable' uploader, here's the closest i got, now for a field test, good luck!

NeoSmart Technologies
25-Jul-2006 05:08


The program mentioned below (CHMOD-Win) has been rewritten since, and CHMOD-Win version 3.0 is available for download at http://neosmart.net/dl.php?id=4



It is a conversion utility for CHMOD on Windows and ACL on Linux, comes in handy for installing commercial scripts or defining security policies.

neil at 11 out of 10
12-Apr-2006 02:20


If you get a warning like chmod(): Operation not permitted in /home/folder/public_html/admin/includefiles/fileupload.php on line 24



You can use the ftp_site() function to send a CHMOD command through.

<?php



$ftp_details['ftp_user_name'] = $row['username'];

$ftp_details['ftp_user_pass'] = $row['password'];

$ftp_details['ftp_root'] = '/public_html/';

$ftp_details['ftp_server'] = 'ftp'.$_SERVER['HTTP_HOST'];



function chmod_11oo10($path, $mod, $ftp_details)

{

    // extract ftp details (array keys as variable names)

    extract ($ftp_details);

    

    // set up basic connection

    $conn_id = ftp_connect($ftp_server);

    

    // login with username and password

    $login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

    

    // try to chmod $path directory

    if (ftp_site($conn_id, 'CHMOD '.$mod.' '.$ftp_root.$path) !== false) {

        $success=TRUE;

    } 

    else {

        $success=FALSE;

    }



    // close the connection

    ftp_close($conn_id);

    return $success;

}

?>

The key thing to remember is that the document root and the ftp root are not the same.

e.g. document root may be "/home/folder/public_html/"

but the ftp root might be "/public_html/"



Hope this helps someone.  You might need this solution if you are on a shared server.

memp
23-Aug-2005 05:04


If you are storing your mode in a variable like



$mode = 0755;



you will run into the inevitable octal mode problem.  An easy way around that is to use the octdec() function.



chmod("some_filename.ext", octdec($mode));

masha at mail dot ru
11-Jul-2005 11:23


Usefull reference:



Value    Permission Level

400    Owner Read

200    Owner Write

100    Owner Execute

40    Group Read

20    Group Write

10    Group Execute

4    Global Read

2    Global Write

1    Global Execute



(taken from http://www.onlamp.com/pub/a/php/2003/02/06/php_foundations.html)

alex at feidesign dot com
01-Apr-2005 07:20


If you cannot chmod files/directories with PHP because of safe_mode restrictions, but you can use FTP to chmod them, simply use PHP's FTP-functions (eg. ftp_chmod or ftp_site) instead. Not as efficient, but works.

info at rvgate dot nl
03-Feb-2005 08:12


When using ftp_rawlist, in order to get the chmod number from the attributes, i use this code:



<?php

function chmodnum($mode) {

    $realmode = "";

    $legal =  array("","w","r","x","-");

    $attarray = preg_split("//",$mode);

    for($i=0;$i<count($attarray);$i++){

        if($key = array_search($attarray[$i],$legal)){

            $realmode .= $legal[$key];

        }

    }

    $mode = str_pad($realmode,9,'-');

    $trans = array('-'=>'0','r'=>'4','w'=>'2','x'=>'1');

    $mode = strtr($mode,$trans);

    $newmode = '';

    $newmode .= $mode[0]+$mode[1]+$mode[2];

    $newmode .= $mode[3]+$mode[4]+$mode[5];

    $newmode .= $mode[6]+$mode[7]+$mode[8];

    return $newmode;

}

?>

some examples:



drwxr-xr-x => 755

drwxr-xr-x => 755

dr-xr-xr-x => 555

drwxr-xr-x => 755

drwxr-xr-x => 755

drwxr-xr-x => 755

drwxr-xr-x => 755

drwxrwxrwt => 776

drwxr-xr-x => 755

drwxr-xr-x => 755

lrwxrwxrwx => 777



used some of already posted code...

haasje at welmers dot net
28-Nov-2004 03:09


For recursive chmod'ing see the function below.

Only really usefull when chmod'ing a tree containing directories only, jet, since you don't want an executable bit on a regular file. Who completes the function so it's accepting strings like "g+w", and it's as usefull as unix "chmod -R" ? ;-)



<?php



function chmod_R($path, $filemode) { 

    if (!is_dir($path))

       return chmod($path, $filemode);



    $dh = opendir($path);

    while ($file = readdir($dh)) {

        if($file != '.' && $file != '..') {

            $fullpath = $path.'/'.$file;

            if(!is_dir($fullpath)) {

              if (!chmod($fullpath, $filemode))

                 return FALSE;

            } else {

              if (!chmod_R($fullpath, $filemode))

                 return FALSE;

            }

        }

    }

 

    closedir($dh);

    

    if(chmod($path, $filemode))

      return TRUE;

    else 

      return FALSE;

} 

?>

PerfectWeb
23-Nov-2004 10:58


As noted by others below... 1) you cannot pass a string to chmod() as the mode, and 2) decimals work as well as octals for the mode.



If you need to come up with the mode on the fly (maybe based on user input) and want to use something like:



$mode = '0'.$owner.$group.$public;



you can use your $mode (which is a string) with chmod like this:



<?php

 // octal mode in a string i.e. '0755'

 $mode = '0'.$owner.$group.$public;



 $mode_dec = octdec($mode);    // convert octal mode to decimal

 chmod($filename, $mode_dec);

?>

fernando at gym-group dot com
12-Nov-2004 10:10


about chmod,

Problably you have a local server to simulate your scripts before upload them to the server. No matter if you use Apache under windows or IIS ,  a chmod instruction like chmod($filename,O777) may not work because windows does not handle that kind of permission's format.

So being in your local server, if you have a only read file and you try to erase, it will show that you dont have permissions even when you have already executed your chmod instrucction correctly. Just up the script it must work well in your internet server if it is a linux machine



sobre chmod,

Probablemente usas un servidor local para probar tus scripts antes de subirlos al servidor en internet. No importa si usas Apache bajo windows o IIS, una instruccion como chmod(nombre_archivo,O777) podr� no trabajar por que windows no maneja esa estructura para definir los permisos.

Estando en tu servidor local, si tienes un archivo de solo lectura y tratas de borrarlo,  se mostrar� un error diciendo que no tienes permisos a�n desp�es de haber ejecutado chmod correctamente. Sube tu script, si tu servidor es una m�quina linux, el script trabajar� sin problemas en internet.



Fernando Yepes C.

Oliver Hankeln
01-Jul-2004 10:21


Well, you don't need octals.

You need a value that can easily computed and remembered if printed in octal. 

511 (decimal) is the same as 777 (octal).

So it's the same wether you write

chmod("foo",511)

or 

chmod("foo",0777)



The latter is just better readable.

raven_25041980 at yahoo dot com
25-May-2004 12:45


If you have a mode as a string, chmod will insanely mess up your permissions. Instead of using 



<?php 



@chmod($file_or_dir_name, $mode);



?>



use 



<?php 



@chmod(file_or_dir_name, intval($mode, 8));



?>



where 8 -> the base to convert into. You need octals, baby, for chmod...



More on intval here: http://www.php.net/manual/en/function.intval.php

agrenier at assertex dot com
02-Apr-2004 08:17


If you find that chmod does not work on your file and that a new file cannot be created, first try to chmod the directory where the file is being created to 0666/0777. Then PHP should be able to write/append files with mode 0644.

agrenier at assertex dot com
02-Apr-2004 08:11


This function will chmod a $filename before writing to it if:



1 - It exists

2 - It is not writeable

3 - PHP has permission to chmod files



If PHP can't chmod, then the script will end. Otherwise it will attempt to write to a new file.



<?php



    function file_write($filename, $flag, &$content) { 

        if (file_exists($filename)) {

            if (!is_writable($filename)) {

                if (!chmod($filename, 0666)) {

                     echo "Cannot change the mode of file ($filename)";

                     exit;

                };

            }

        }

        if (!$fp = @fopen($filename, $flag)) {

            echo "Cannot open file ($filename)";

            exit;

        }

        if (fwrite($fp, $content) === FALSE) {

            echo "Cannot write to file ($filename)";

            exit;

        } 

        if (!fclose($fp)) {

            echo "Cannot close file ($filename)";

            exit;

        }

    }



?>

Jazeps Basko
27-Jan-2004 10:37


To convert 'rwxr-xr--' to a number representation of chmod, i use this:

<?php

    function chmodnum($mode) {

        $mode = str_pad($mode,9,'-');

        $trans = array('-'=>'0','r'=>'4','w'=>'2','x'=>'1');

        $mode = strtr($mode,$trans);

        $newmode = '';

        $newmode .= $mode[0]+$mode[1]+$mode[2];

        $newmode .= $mode[3]+$mode[4]+$mode[5];

        $newmode .= $mode[6]+$mode[7]+$mode[8];

        return $newmode;

    }

?>

pmichaud at pobox dot com
20-Apr-2003 05:45


In the previous post, stickybit avenger writes:


    Just a little hint. I was once adwised to set the 'sticky bit', i.e. use 1777 as chmod-value...





Note that in order to set the sticky bit on a file one must use '01777' (oct) and not '1777' (dec) as the parameter to chmod:





<?php


    chmod("file",01777);   // correct


     chmod("file",1777);    // incorrect, same as chmod("file",01023), causing no owner permissions!


?>





Rule of thumb: always prefix octal mode values with a zero.

sticky bit avenger
12-Mar-2003 06:30


Just a little hint. I was once adwised to set the 'sticky bit', i.e. use 1777 as chmod-value. Do NOT do this if you don't have root privileges. When 'sticky bit' is set ONLY the fileuser can delete it afterwards, typically 'httpd' or something like that in case of an upload-script for example. I was unaware of this and actually had to make a script for deleting these files as I could not do this from ftp/ssh even though I did have read/write/execute access to both files and folders. Use simply '0777' or similiar.

Half-Dead at nospam dot com
08-Nov-2002 05:42


[Editor's note:


That is due the fact Win32 systems treat premissions. You do not really have any other levels but read-only.





Maxim]








On WinME with apache chmod also works to a certain limit.





What happens is that apparently only the first number is counted, so 0666 (read-write) is the same as 0777, 0644, 0600, etc, and 0444 (read-only) is the same as 477, 400, etc.





..didn't test 0500 series

FF7Cayn at gmx dot de
28-Oct-2001 07:09


It does work on Windows.


I use Win 98 with the Sambar Server.


The only chmods allowed are the 775 and 666 mod. 775 for non-writeable and 666 for writeable. The only thing is that the usergroups doesn't work.


Note: the 0 at the start doesn't work with windows. use only the decimal kind.


Have fun :)

jon at zend dot com
15-Oct-2001 10:37


if 'mode' is held in a variable and is and octal value you need to convert it to decimal before passing it to the function:


chmod ($filename, octdec($mode))

gnettles2 at home dot com
25-Aug-2001 01:20


Usually when you're trying to write to af file, you'll need to chmod the file to something like 666 or 755. You can use a command to chmod the file for you, which is especially useful when you're making a script where you're setting it up so that your users don't have to peform a bunch of actions to setup the script. When i wrote my news program script, I only had two files. install.php and config.php. All you had to do was chmod install.php to 666 and open it up in a web browser and answer a few questions. The script itself setup the rest of the files and chmodded them for you.

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