Hello there and greetings.
We upgraded our OJS 2.4.6 successfully to OJS 3.1.1.2 but wonder wether it would be wise or recommended to upgrade our PHP installation to the newest version too.
Currently we run
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Debian Linux 8
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PHP 5.6.38
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MySQL V.14.14 Distr. 5.5.60 for debian-linux-gnu
Regards
Frank Hoffmann