permission denied php unlink

unlink

(PHP 4, PHP 5, PHP 7, PHP 8)

unlink — Удаляет файл

Описание

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Возвращаемые значения

Возвращает true в случае успешного выполнения или false в случае возникновения ошибки.

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Примеры

Пример #1 Пример простого использования unlink()

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User Contributed Notes 11 notes

This will delete all files in a directory matching a pattern in one line of code.

Deleted a large file but seeing no increase in free space or decrease of disk usage? Using UNIX or other POSIX OS?

However, it’s perfectly fine for a file to have several names (see the link() function), in the same or different directories. All the names will refer to the file body and `keep it alive’, so to say. Only when all the names are removed, the body of file actually is freed.

The caveat:
A file’s body may *also* be `kept alive’ (still using diskspace) by a process holding the file open. The body will not be deallocated (will not free disk space) as long as the process holds it open. In fact, there’s a fancy way of resurrecting a file removed by a mistake but still held open by a process.

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:

Here the simplest way to delete files with mask

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Warning: unlink($name): Permission denied

First of all, I’ll request to not mark my question as duplicate. Because I have googled my problem a lot and didn’t find solution of my problem. There is a lot of problem of permission denied on unlink but my problem for this is totally different. So, first read my problem carefully below.

I am creating a user based website. On profile edit, i am updating profile picture. Currently, there is no image on users database, but i am checking in backend that if profile pic exists in user db, then unlink (delete) that first from folder and then update with new one. But i am getting permission denied error on unlink if there is no image. But if there is image, i didn’t get any permission denied error. So all i need to call that unlink function only on that condition if user image exists in db. But I’ve tried to do this a lot. I am failed again and again.
Here is my function code:

Now, i’ve tried to put check condition first on fetching.

It’s also not working, i am still getting that permission denied error. On edit profile, there is one button named «Update profile pic», and new user can upload/update from that.
Currently there is no image in users database row. (So, i am still updating it, because i am doing it with only one function/page. ) On update function, i am first fetching user image, and want to check that if user image exists there then delete/unlink that from folder and then run update function below.

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‘unlink’, Permission denied error when executing function [exec]

This is the file test1.php:

This is file test2.php:

If I run file test2.php while test1.php is running, an error will occur:

Warning: unlink(E:/temp/test.xml): Permission denied in C:\xampp\htdocs\test2.php on line 45

When I only run test2.php, without test1.php, this error does not occur. Why does unlink give a Permission denied error when I execute the function?

I’m using XAMPP 3.2 vs php 5.6 with Windows 7.

4 Answers 4

You’re silencing errors in fopen which means that if, at any point, the file fails to open (perhaps because of a memory limit being reached in XAMPP, for example), you’d have no way of knowing in your script (you can view it in your logs).

Deletes filename. Similar to the Unix C unlink() function. An E_WARNING level error will be generated on failure.

An easy solution would be to silence errors on unlink as well.

That way it will fail gracefully if your function fails to write a file. Another option is to check if the file exists before trying to unlink.

That should help you debug what is going on.

Example: namespace Test;

By adding exception handling, you can debug this kind of behavior for yourself and find the root cause of the issue.

A couple final notes:

I run Linux, so it’s not easy for me to test this behavior on a Windows 7 XAMPP machine. However, I suspect it is because the system is locking due to limited I/O resources. Note that, according to the manual, Windows places a madatory lock on the file (whereas in Linux the lock is advisory). Running flock in a massive loop and echo in a massive loop on a limited resources system can lead to resources failing. If you intend to run something like this in production you won’t run into it as often but you will still need to account for it. Exception handling and error logging can ensure that when the file doesn’t work you will have enough data to debug.

Assuming unlink is the problem is not a safe assumption at all.

As stated, silencing unlink or checking to see if the file exists will silence this error.

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EACCES: permission denied, unlink

npm 5.0.3. node 8.1.4. yarn 0.24.5 macOS Sierra 10.12.4

When I launched command again it installs packages, but after command yarn run dev it shows following:

2 Answers 2

First of all, you need to check permission by running the command:

I received the next response:

Then if you saw that root had permission, but you don’t have, you should add permission to yourself:

Change permissions for files, folders, or disks on Mac Permission settings determine who can view and alter files on the computer. You change permission settings at the bottom of the Info window for a file, folder, or disk in the Finder. For example, you can change permission settings for a folder so that other users who log in to your Mac, or connect to it for file sharing, can view but not change files in a folder.

The permission settings at the bottom of an Info window. Assign permissions to users and groups On your Mac, select a disk, folder, or file, then choose File > Get Info.

Click a user or group in the Name column, then choose a privilege setting from the pop-up menu.

Read & Write: Allows a user to open the item and change it.

Read only: Allows a user to open the item, but not change its contents.

Write only (Drop Box): Makes a folder into a drop box. Users can copy items to the drop box, but can’t open it. Only the owner of the drop box can open it.

No Access: Blocks all access to the item.

Apply permissions to all items in a folder or a disk On your Mac, select a folder or disk, then choose File > Get Info.

Change an item’s owner On your Mac, select the item, then choose File > Get Info.

If the new owner’s name isn’t listed in the Name column in the Sharing & Permissions section, click the Add button to add the new owner.

Add or remove a user or group in the Name column On your Mac, select an item, then choose File > Get Info.

In the Sharing & Permissions section, do any of the following:

Add a user or group: Click the Add button below the list, select a user or group, then click Select.

Remove a user or group: Select the user or group, then click the Remove button below the list.

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PHP mkdir: Permission denied problem

13 Answers 13

I know this is an old thread, but it needs a better answer. You shouldn’t need to set the permissions to 777, that is a security problem as it gives read and write access to the world. It may be that your apache user does not have read/write permissions on the directory.

Here’s what you do in Ubuntu

Make sure all files are owned by the Apache group and user. In Ubuntu it is the www-data group and user

Next enabled all members of the www-data group to read and write files

The php mkdir() function should now work without returning errors

Late answer for people who find this via google in the future. I ran into the same problem.

NOTE: I AM ON MAC OSX LION

What happens is that apache is being run as the user «_www» and doesn’t have permissions to edit any files. You’ll notice NO filesystem functions work via php.

Open a finder window and from the menu bar, choose Go > Go To Folder > /private/etc/apache2

now open httpd.conf

change the username:

Now restart apache by running this form terminal:

If it still doesn’t work, I happen to do the following before I did the above. Could be related.

Open terminal and run the following commands: (note, my webserver files are located at /Library/WebServer/www. Change according to your website location)

Don’t set permissions to 777 when using mkdir in PHP

Link only answers are not considered good practice on StackOverflow, but the advice that is given here should generally NOT be followed up.

I would like to revert to this great answer on a similar question. I quote:

Please stop suggesting to use 777. You’re making your file writeable by everyone, which pretty much means you lose all security that the permission system was designed for. If you suggest this, think about the consequences it may have on a poorly configured webserver: it would become incredibly easy to «hack» the website, by overwriting the files. So, don’t.

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