PHP Unlink Not working | 易学教程

问题

I am trying to delete photo in php using unlink. I have used it earlier on other server but this time it is not working. I have used absolute path for a test but still does not works:

I have used it as: unlink('img1.jpg');

and :

unlink('http://www.mysite.com/img1.jpg');

Please anyone having such experience?

回答1:

url not allow in ulink function

can you please used this

It's better, also safety wise to use an absolute path. But you can get this path dynamically.

E.g. using:

getcwd();

Depending on where your PHP script is, your variable could look like this:

$deleteImage =  getcwd() . 'img1.jpg';

unlink($deleteImage);

check this

bool unlink ( string $filename [, resource $context ] )

and

filename
Path to the file.

So it only takes a string as filename.

Make sure the file is reachable with the path from the location you execute the script. This is not a problem with absolute paths, but you might have one with relative paths.

回答2:

Even though unlink() supports URLs (see here) now, http:// is not supported: http wrapper information

use a filesystem path to delete the file.

回答3:

If you use unlink in a linux or unix you should also check the results of is_writable ( string $filename ) And if the function returns false, you should check the file permissions with fileperms ( string $filename ).

File permissions are usual problems on webspaces, e.g. if you upload an file per ftp with a ftp user, and the webserver is running as an different user.

If this is the problem, you have do to a

chmod o+rwd img1.jpg

chmod 777 img1.jpg

to grand write (and delete) permissions for other Users.

回答4:

use filesystem path,
first define path like this:

define("WEB_ROOT",substr(dirname(__FILE__),0,strlen(dirname(__FILE__))-3));

and check file is exist or not,if exist then unlink the file.

$filename=WEB_ROOT."img1.jpg";
if(file_exists($filename))
{
$img=unlink(WEB_ROOT."img1.jpg");
}

回答5:

unlink won't work with unlink('http://www.mysite.com/img1.jpg');

use instead unlink($_SERVER['DOCUMENT_ROOT'].'img1.jpg');//takes the current directory or,

unlink($_SERVER['DOCUMENT_ROOT'].'dir_name/img1.jpg');

There may be file permission issue.please check for this.

回答6:

Give relative path from the folder where images are kept to the file where you are writing script. If file structure is like:

-your php file
-images
  -1.jpg

then 

unlink(images/1.jpg);

Or there may be some folder permission issue. Your files are on a server or you are running it on localhost? If it is on a server then give 755 permission to the images folder.

回答7:

unlink($fileName); failed for me.
Then I tried using the realpath($fileName) function as unlink(realpath($fileName)); it worked.

Just posting it, in case if any one finds it useful.

php unlink

来源：https://stackoverflow.com/questions/19026809/php-unlink-not-working

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unlink