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.
unlink
说明
bool unlink ( string filename )删除 filename。和 Unix C 的 unlink() 函数相似。如果成功则返回 TRUE，失败则返回 FALSE。
注: 自 PHP 5.0.0 起 unlink() 也可以用于某些 URL 封装协议。参考附录 L 中的列表看哪些封装协议支持 unlink()。
注: 对 context 的支持是 PHP 5.0.0 添加的。有关 context 的说明请参考参考 CXLI, Stream Functions。
参见目录删除函数 rmdir()。
add a note
User Contributed Notes
khalidz83 at yahoo dot co dot uk
15-Feb-2006 11:18
15-Feb-2006 11:18
Anarcho at ssm-clan dot de
27-Nov-2005 06:56
27-Nov-2005 06:56
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
06-Jun-2005 03:30
06-Jun-2005 03:30
<?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, $rcs)) {
return false;
}
} else {
trigger_error('Param #1 must be filename or glob pattern, or array of filenames or glob patterns', E_USER_ERROR);
return false;
}
return true;
}
?>
jchase at solidmark dot com
21-May-2005 01:05
21-May-2005 01:05
[Editor's note: A suggestion for a work-around was submitted by argistof at gmail dot com: You can use the recursive option (see man chmod) when chmodding, for instance 'chmod 777 directory/ -R'. Be aware though, this will change the permissions of all files and folders in the diectory.]
Just a note which you probably all know, but I didn't, and it might save another poor sap some unnecessary time:
I was doing unlink() and fopen() on a file and got a permission denied error, even after chmoding the file to 0777.
The folder that contains the file must ALSO have write permission. Took a headache to find this out.
Hope this helps someone :)
kickthedonkey at gmail dot com
17-May-2005 07:24
17-May-2005 07:24
Regarding the comment by 'admin at crazydrumguy dot info': You might want to consider using is_file instead of file_exists if you're wanting to target a file specifically (and not a directory). file_exists($name) will return true if $name contains a path to a directory (which may or may not be what you want to do...)
ashley at semantic dot org
02-Apr-2005 06:50
02-Apr-2005 06:50
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 02:19
07-Feb-2005 02:19
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
15-Sep-2004 01:54
15-Sep-2004 01:54
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 11:22
08-Sep-2004 11:22
To delete files using wildcards:
<?
function delfile($str)
{
foreach(glob($str) as $fn) {
unlink($fn);
}
}
?>