Php cron error on centos 7.3

Server
1

I have full of these errors in my log files. It flood up my log file.
PHP Fatal error: PHP Startup: apc_mmap: mkstemp on /tmp/apc.9hrTAY failed: in Unknown on line 0

php is 5.6

2

Sounds like a PHP setup issue - please use Google or your preferred search engine ...

https://www.google.de/search?client=firefox-b-ab&dcr=0&ei=knCeWvzeOc7ewQKc95_YDw&q=PHP+Fatal+error%3A+PHP+Startup%3A+apc_mmap%3A+mkstemp+on&oq=PHP+Fatal+error%3A+PHP+Startup%3A+apc_mmap%3A+mkstemp+on&gs_l=psy-ab.3...6371.6371.0.7410.1.1.0.0.0.0.143.143.0j1.1.0....0...1c.1.64.psy-ab..0.0.0....0.SaUcbaxjh5M