问题
I'm trying to write a file to my /tmp directory (on an apache server) with the php fopen function, but it fails:
<?php
$handle = fopen("/tmp/test.txt", "x");
if ($handle)
echo "Success!";
else
print_r(error_get_last());
This returns the error message:
failed to open stream: No such file or directory.
The /tmp directory has permissions set to drwxrwxrwt and I can see that the web user is writing other files to it. Mysteriously, if I point the script to another folder with permissions 777, it returns success. But my open_basedir has no value. I have safe_mode=on and allow_url_fopen=off, but I don't think that should explain it?
This is PHP 5.3.10 on Apache Httpd 2.0.
回答1:
I had exactly the same problem. PHP reported no problem with opening file in /tmp/myoutputfile, but no file was in that path. Then I did
find / -name "myoutputfile"
and found it in /tmp/systemd-…/myoutputfile.
I've found this article on Google.
So, in my case, it was a Systemd and Apache Httpd combination. I hope this will help to someone.
回答2:
Your problem is likely caused by the combination of systemd and apache. It's a security feature called PrivateTmp, and obviously it's an opt out.
If you don't want it, you can disable it like this:
- Outcomment the respective switch in
/etc/systemd/system/multi-user.target.wants/apache2.service:#PrivateTmp=true - Restart systemd:
sudo systemctl daemon-reload - Restart apache:
sudo systemctl restart apache2
回答3:
According to the error message displayed, there is no folder /tmp/. Perhaps the tmp folder is somewhere else than the root?
This error will not show if the file actually doesn't exist, as it will attempt to create it.
Method x also returns a warning if the file already exists. (doc: http://www.php.net/manual/en/function.fopen.php)
I think this also goes for another reason this could go wrong, is the user which executes PHP doesn't have rights to write in the /tmp/ folder.
回答4:
Try to add /tmp to open_basedir. For example:
php_admin_value open_basedir /some/path:/another/path:/tmp
I'm not sure this is the problem you actually faced, but I found your question while looking for this solution so I guess that might help someone else.
来源：https://stackoverflow.com/questions/10752396/cant-write-to-tmp-with-php-despite-777-permissions-and-no-open-basedir-value