问题
I am trying to write a query to a file for debugging. The file is in database/execute.php. The file I want to write to is database/queries.php.
I am trying to use file_put_contents(\'queries.txt\', $query)
But I am getting
file_put_contents(queries.txt) [function.file-put-contents]: failed to open stream: Permission denied
I have the queries.txt file chmod\'d to 777, what could the issue be?
回答1:
Try adjusting the directory permissions.
from a terminal, run chmod 777 database (from the directory that contains the database folder)
apache and nobody will have access to this directory if it is chmodd'ed correctly.
The other thing to do is echo "getcwd()". This will show you the current directory, and if this isn't '/something.../database/' then you'll need to change 'query.txt' to the full path for your server.
回答2:
The other option
is that you can make Apache (www-data), the owner of the folder
sudo chown -R www-data:www-data /var/www
that should make file_put_contents work now. But for more security you better also set the permissions like below
find /var/www -type d -print0 | xargs -0 chmod 0755 # folder
find /var/www -type f -print0 | xargs -0 chmod 0644 # files
- change
/var/wwwto the root folder of your php files
回答3:
Realise this is pretty old now, but there's no need to manually write queries to a file like this. MySQL has logging support built in, you just need to enable it within your dev environment.
Take a look at the documentation for the 'general query log':
http://dev.mysql.com/doc/refman/5.1/en/query-log.html
回答4:
Guys I had this problem for 1 month and did everything but couldn't fix it, but now I know the solution.
I use a shared linux hosting, when my admin changed the php to 5.3 I got many error for the "file_put_contents" code. try to test my plan:
In your host create a file like mytest.php, and put this code in and save:
<?php mail('Your-EMail','Email-Title','Email-Message'); ?>
Open the URL "www.your-domain.com/mytest.php" one time and then check your email. you should have an email from your host with the information you entered in mytest.php, check the sender name. if its from Nobody you have problem about "Permission Denied" because something not defined and if the sender name is like my id: iietj8qy@hostname5.netly.net you dont have prob.
My admin changed the server and installed the host again I think and the problem got solved, tell your host administration what I told you and maybe they find the answer.
hope it helps you!
回答5:
I know that it is a very old question, but I wanted to add the good solution with some in depth explanation. You will have to execute two statements on Ubuntu like systems and then it works like a charm.
Permissions in Linux can be represented with three digits. The first digit defines the permission of the owner of the files. The second digit the permissions of a specific group of users. The third digit defines the permissions for all users who are not the owner nor member of the group.
The webserver is supposed to execute with an id that is a member of the group. The webserver should never run with the same id as the owner of the files and directories. In Ubuntu runs apache under the id www-data. That id should be a member of the group for whom the permissions are specified.
To give the directory in which you want to change the content of files the proper rights, execute the statement:
find %DIR% -type d -exec chmod 770 {} \;
.That would imply in the question of the OP that the permissions for the directory %ROOT%/database should be changed accordingly. It is therefor important not to have files within that directory that should never get changed, or removed. It is therefor best practice to create a separate directory for files whose content must be changed.
Reading permissions (4) for a directory means being able to collect all files and directories with their metadata within a directory. Write permissions (2) gives the permission to change the content of the directory. Implying adding and removing files, changing permissions etc.. Execution permission (1) means that you have the right to go into that directory. Without the latter is it impossible to go deeper into the directory. The webserver needs read, write and execute permissions when the content of a file should be changed. Therefor needs the group the digit 7.
The second statement is in the question of the OP:
find %DOCUMENT_ROOT%/database -type f -exec chmod 760 {} \;
Being able to read and write a document is required, but it is not required to execute the file. The 7 is given to the owner of the files, the 6 to the group. The webserver does not need to have the permission to execute the file in order to change its content. Those write permissions should only be given to files in that directory.
All other users should not be given any permission.
For directories that do not require to change its files are group permissions of 5 sufficient. Documentation about permissions and some examples:
https://wiki.debian.org/Permissions
https://www.linux.com/learn/tutorials/309527-understanding-linux-file-permissions
http://www.linux.org/threads/file-permissions-chmod.4094/
回答6:
Gathering info from this link stackoverflow-image save doesn't work with chmod 777 and from user azerafati and Loek Bergman
if you were to look under /etc/apache/envvars file you will see something like:
export APACHE_RUN_USER=www-data
export APACHE_RUN_GROUP=www-data
Apache is run under the username 'www-data'
'0755' means the file owner can read/write/execute but group and other users cannot write. so in ur terminal, cd to the folder containing your 'images' folder. then type:
find images -type d -exec chmod 0755 {} \;
find images -type f -exec chmod 0755 {} \;
sudo chown -R www-data:www-data images
you must change persmissions first before changing owner. enter your password when prompted. this will make 'www-data' owner of the images folder.
your upload should now work.
回答7:
For anyone using Ubuntu and receiving this error when loading the page locally, but not on a web hosting service,
I just fixed this by opening up nautilus (sudo nautilus) and right click on the file you're trying to open, click properties > Settings > and give read write to 'everyone else'
回答8:
had the same problem; my issue was selinux was set to enforcing.
I kept getting the "failed to open stream: Permission denied" error even after chmoding to 777 and making sure all parent folders had execute permissions for the apache user. Turns out my issue was that selinux was set to enforcing (I'm on centos7), this is a devbox so I turned it off.
回答9:
This can be resolved in resolved with the following steps :
1. $ php artisan cache:clear
2. $ sudo chmod -R 777 storage
3. $ composer dump-autoload
Hope it helps
回答10:
If you are pulling from git from local to server, you will need to clear cache sometimes because of the view files it gets uploaded with it / or other cached files .
php artisan cache:clear
Sometimes it might just to the trick if your application was working before the git pull
回答11:
There 2 way to resolve this issues
1. use chmod 777 path-to-your-directory.
if it does not work then
2. simply provide the complete path of your file query.txt.
回答12:
Here the solution.
To copy an img from an URL.
this URL: http://url/img.jpg
$image_Url=file_get_contents('http://url/img.jpg');
create the desired path finish the name with .jpg
$file_destino_path="imagenes/my_image.jpg";
file_put_contents($file_destino_path, $image_Url)
回答13:
Furthermore, as said in file_put_contents man page in php.net, beware of naming issues.
file_put_contents($dir."/file.txt", "hello");
may not work (even though it is correct on syntax), but
file_put_contents("$dir/file.txt", "hello");
works. I experienced this on different php installed servers.
来源：https://stackoverflow.com/questions/4917811/file-put-contents-permission-denied