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Last updated: Tue, 27 Nov 2007

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Filtro> <Sistema de archivos
Last updated: Tue, 27 Nov 2007
 
add a note add a note User Contributed Notes
unlink
chris at bigfatstupid dot com
13-Nov-2007 09:11
I had an issue with unlink when I tried to delete a file using the URL.  I didn't find any information stating this anywhere so I thought I would inform any other newbies that you cannot use a URL, ie unlink(http://www.yoursite.com/files/file).
james at NOSPAM dot telserco dot com
29-Sep-2007 04:10
Cheap and dirty example for cleaning a directory of files so many seconds old.

        function cleantmp() {
                $seconds_old = 3600;
                $directory = "/var/tmp";

                if( !$dirhandle = @opendir($directory) )
                        return;

                while( false !== ($filename = readdir($dirhandle)) ) {
                        if( $filename != "." && $filename != ".." ) {
                                $filename = $directory. "/". $filename;

                                if( @filemtime($filename) < (time()-$seconds_old) )
                                        @unlink($filename);
                        }
                }
        }
rahulnvaidya at gmail dot com
03-Aug-2007 12:36
ggarciaa's post above has one small error, it will ignore file and directory strings that are evaluated as false (ie. "0")

Fixed code is below (false !==)

<?php
// ggarciaa at gmail dot com (04-July-2007 01:57)
// I needed to empty a directory, but keeping it
// so I slightly modified the contribution from
// stefano at takys dot it (28-Dec-2005 11:57)
// A short but powerfull recursive function
// that works also if the dirs contain hidden files
//
// $dir = the target directory
// $DeleteMe = if true delete also $dir, if false leave it alone

function SureRemoveDir($dir, $DeleteMe) {
    if(!$dh = @opendir($dir)) return;
    while (false !== ($obj = readdir($dh))) {
        if($obj=='.' || $obj=='..') continue;
        if (!@unlink($dir.'/'.$obj)) SureRemoveDir($dir.'/'.$obj, true);
    }
    if ($DeleteMe){
        closedir($dh);
        @rmdir($dir);
    }
}

//SureRemoveDir('EmptyMe', false);
//SureRemoveDir('RemoveMe', true);

?>
ggarciaa at gmail dot com
04-Jul-2007 09:00
<?php
// ggarciaa at gmail dot com (04-July-2007 01:57)
// I needed to empty a directory, but keeping it
// so I slightly modified the contribution from
// stefano at takys dot it (28-Dec-2005 11:57)
// A short but powerfull recursive function
// that works also if the dirs contain hidden files
//
// $dir = the target directory
// $DeleteMe = if true delete also $dir, if false leave it alone

function SureRemoveDir($dir, $DeleteMe) {
    if(!$dh = @opendir($dir)) return;
    while (($obj = readdir($dh))) {
        if($obj=='.' || $obj=='..') continue;
        if (!@unlink($dir.'/'.$obj)) SureRemoveDir($dir.'/'.$obj, true);
    }
    if ($DeleteMe){
        closedir($dh);
        @rmdir($dir);
    }
}

//SureRemoveDir('EmptyMe', false);
//SureRemoveDir('RemoveMe', true);

?>
torch at torchsdomain dot com
22-Nov-2006 10:27
Here is simple function that will find and remove all files (except "." ones) that match the expression ($match, "*" as wildcard) under starting directory ($path) and all other directories under it.

function rfr($path,$match){
   static $deld = 0, $dsize = 0;
   $dirs = glob($path."*");
   $files = glob($path.$match);
   foreach($files as $file){
      if(is_file($file)){
         $dsize += filesize($file);
         unlink($file);
         $deld++;
      }
   }
   foreach($dirs as $dir){
      if(is_dir($dir)){
         $dir = basename($dir) . "/";
         rfr($path.$dir,$match);
      }
   }
   return "$deld files deleted with a total size of $dsize bytes";
}
paul at pes-systems dot net
16-Aug-2006 08:27
A work around for the Permission Denied problem.

I used ftp_connect() then ftp_delete() to erase files which unlink could not erase due to permision problems
khalidz83 at yahoo dot co dot uk
15-Feb-2006 05:18
If you get an error while deleting a file from the system, check who is the owner of the file. For example if you move to another system and the owner is 'nobody' then the owner should be nobody for that file on the new system.If you delete as another user, you will get an error.
Anarcho at ssm-clan dot de
27-Nov-2005 12:56
Just to be a bit more accurate to the post of "jchase at solidmark dot com":

On unixoide systems you only need write permission for the directory to delete a file. The permissions of the file are nonrelevant.

You need file permissions if you want to change the file data or to read the data.
bishop
05-Jun-2005 10:30
<?php
/**
 * rm() -- Vigorously erase files and directories.
 *
 * @param $fileglob mixed If string, must be a file name (foo.txt), glob pattern (*.txt), or directory name.
 *                        If array, must be an array of file names, glob patterns, or directories.
 */
function rm($fileglob)
{
    if (is_string($fileglob)) {
        if (is_file($fileglob)) {
            return unlink($fileglob);
        } else if (is_dir($fileglob)) {
            $ok = rm("$fileglob/*");
            if (! $ok) {
                return false;
            }
            return rmdir($fileglob);
        } else {
            $matching = glob($fileglob);
            if ($matching === false) {
                trigger_error(sprintf('No files match supplied glob %s', $fileglob), E_USER_WARNING);
                return false;
            }      
            $rcs = array_map('rm', $matching);
            if (in_array(false, $rcs)) {
                return false;
            }
        }      
    } else if (is_array($fileglob)) {
        $rcs = array_map('rm', $fileglob);
        if (in_array(false, $rcs)) {
            return false;
        }
    } else {
        trigger_error('Param #1 must be filename or glob pattern, or array of filenames or glob patterns', E_USER_ERROR);
        return false;
    }

    return true;
}
?>
jchase at solidmark dot com
21-May-2005 08:05
[Editor's note: A suggestion for a work-around was submitted by argistof at gmail dot com: You can use the recursive option (see man chmod) when chmodding, for instance 'chmod 777 directory/ -R'. Be aware though, this will change the permissions of all files and folders in the diectory.]

Just a note which you probably all know, but I didn't, and it might save another poor sap some unnecessary time:

I was doing unlink() and fopen() on a file and got a permission denied error, even after chmoding the file to 0777. 

The folder that contains the file must ALSO have write permission.  Took a headache to find this out. 

Hope this helps someone :)
ashley at semantic dot org
02-Apr-2005 01:50
Actually you should use "@unlink" rather than testing with file_exists. The former is atomic, whereas the latter can break if you can't guarantee only one process will try to delete a given file at a time.
dagski_AT_gmail_DOT_com
07-Feb-2005 08:19
before you could unlink a file created which uses a handle e.g.,

$handle = sqlite('temp.db');

unset($handle); first befofe
unlink($handle);

to avoide permission denied error.
chris at vibenewmedia dot com
14-Sep-2004 08:54
To delete all files of a particular extension, or infact, delete all with wildcard, a much simplar way is to use the glob function.  Say I wanted to delete all jpgs .........

<?php

foreach (glob("*.jpg") as $filename) {
   echo "$filename size " . filesize($filename) . "\n";
   unlink($filename);
}

?>
pc AT newagelab DOT com DOT ua
08-Sep-2004 06:22
To delete files using wildcards:

<?
function delfile($str)
{
    foreach(glob($str) as $fn) {
        unlink($fn);
    }
}
?>
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Filtro> <Sistema de archivos
Last updated: Tue, 27 Nov 2007
 
 
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