Possible to change temp folder for dbisql on linux?

I have dbisql installed on an AWS Linux AMI EC2 instance. I am calling it from inside a PHP script using the exec command. The script is run from the command line.

It works perfectly, but I can only get it to work if I change the owner of the /tmp directory to the username that PHP is running under. I get permissions errors otherwise.

• Will I run into any problems by changing the owner of the /tmp folder? I'm not a Linux expert and I don't know what all uses it.
• Is it possible to change the temp folder that dbisql uses to something else?

Thank you!