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Mimetype> <Filesystem Functions
Last updated: Fri, 05 Sep 2008

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Mimetype> <Filesystem Functions
Last updated: Fri, 05 Sep 2008
 
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unlink
southsentry at yahoo dot com
31-Aug-2008 08:23
This is in response to alvaro at demogracia dot com

Yes, I found that out and have had to wrap it with is_file:

<?php
if(is_file("$file")) {
unlink("$file");
}
?>
PD
06-Aug-2008 03:07
I have been working on some little tryout where a backup file was created before modifying the main textfile. Then when an error is thrown, the main file will be deleted (unlinked) and the backup file is returned instead.

Though, I have been breaking my head for about an hour on why I couldn't get my persmissions right to unlink the main file.

Finally I knew what was wrong: because I was working on the file and hadn't yet closed the file, it was still in use and ofcourse couldn't be deleted :)

So I thought of mentoining this here, to avoid others of making the same mistake:

<?php
// First close the file
fclose($fp);

// Then unlink :)
unlink($somefile);
?>
alvaro at demogracia dot com
24-Jun-2008 11:18
It's not mentioned in the manual but unlink() raises a warning when the operation fails.
ayor ATTTTT ayor.biz
20-Dec-2007 04:02
ggarciaa's post above has already one small error, closedir has to be used even if $DeleteMe is 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);
    }

    closedir($dh);
    if ($DeleteMe){
        @rmdir($dir);
    }
}

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

?>
james at NOSPAM dot telserco dot com
29-Sep-2007 05:10
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
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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Mimetype> <Filesystem Functions
Last updated: Fri, 05 Sep 2008
 
 
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