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Directory worked by PHP on webserver

Hi Expert,
I have running php on a website. I am now facing a problem with location/directory working by php. I have tried to create and update a file on a linux server via web+php. Ultimately, I have come to know that it is working in this path /tmp/systemd-private-ce742af7deeb4863bd593a9da4911aba-httpd.service-Nct0cB/tmp/ instead of pure /tmp/. How do I configure and control where php should actually work on linux directory?
Could you please suggest how to overcome the issue?