Ubuntu 18.04.5 LTS PHP 7.3.28 Apache/2.4.29
I am occasionally getting this error. It doesnt happen on every request, and when I fix the permissions and restart Apache it goes away for a bit. But, it always comes back after a short amount of time.
Warning: Unknown: Unable to create temporary file, Check permissions in temporary files directory. in Unknown on line 0
It is proving quite difficult to debug the problem, as it is a seemingly random issue and have not been able to find the root cause.
I would like to know if anyone has experienced anything similar, and what was done to resolve it.
I have increased the post_max_size and uncommented the sys_temp_dir values in my php.ini, but they have had no effect.
Check the path of the temporary folder you're using and make sure the apache user can write into that folder. You can also try to create a new temporary directory owned by the apache user and configure php to write into it.