Can't write to /tmp with php, despite 777 permissions and no open_basedir value

Question

I\'m trying to write a file to my /tmp directory (on an apache server) with the php fopen function, but it fails:

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Answer 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.