tempnam(): warnings in error_log

[dsm...@countercube.com]

I am getting this warning written to an error file every time the CRON runs a particular script.  

[18-Mar-2021 07:01:03 America/New_York] PHP Notice:  tempnam(): file created in the system's temporary directory in /home/counter/public_html/vendor/troydavisson/phrets/src/Session.php on line 547

Does anyone know how I can stop this?  

Thanks

[dsm...@countercube.com]

The original code in the sessions.php was this.           

 'curl' => [ CURLOPT_COOKIEFILE => tempnam('/tmp', 'phrets') ]

It was throwing errors in PHP 7  so under the advisement of someone on this group, I changed it to this...

'curl' => [ CURLOPT_COOKIEFILE => tempnam(sys_get_temp_dir(), 'phrets') ]

Now I am getting the new error after several month of working fine.