Updates for better compliance with PHP7 and above (Fixes BUGZ-3932)

Oxana Smirnovarequested to merge
oxana/arc:arc-mon-php7 into master

Some cleanup in the monitor and updates for compliance with PHP7 and PHP8. Tested with PHP 7.4.13 and PHP5. Fixes BUGZ-3932.

Edited by Maiken

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