Deprecation warnings when attempting real-time Graphs with PHP8.1

[manhvu1997]

I installed cacti 1.2.20. I created a graph and device success, but when I viewed the graph in realtime, I faced the issue below:

The log file said:
2022-07-01 12:44:11 - ERROR PHP DEPRECATED: Implicit conversion from float 35.4375 to int loses precision in file: /var/www/html/cacti/lib/rrd.php on line: 3670
2022-07-01 12:44:11 - CMDPHP PHP ERROR Backtrace: (/graph_realtime.php[244]:rrdtool_create_error_image(), /lib/rrd.php[3670]:wordwrap(), CactiErrorHandler())

Can you help me to fix that?

[netniV]

This bug still exists under v1.2.22, what PHP version are you running?

[manhvu1997]

Thanks for your reply
My PHP version is 8.1

[TheWitness]

I saw this the other day and neglected to look into it.

[manhvu1997]

How can I change the PHP core from PHP 8.1 to PHP 7.4 on cacti?

[TheWitness]

You should not need to downgrade as this is a very narrowly defined error and only happens when your Data Sources have not had their RRDfiles created. But if you still want to do it, you need to do it through aptitude (apt).

[manhvu1997]

I fixed it, but I faced new issue, can you help me to fix this: