Quote:
Originally Posted by porn-update
Can a downgrade of PHP create problems? Even if the server is new/empty
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In theory on a fresh server you should be fine with downgrading.
In practice there may be parts of your site that don't work well with one of the two versions, depending on for what version they were written. The differences between PHP5 and PHP7 may be the reason why you've experienced drop in traffic earlier. Something probably didn't work as it's supposed to but it went unnoticed. If you can confirm that your code works on both versions PHP7 is faster so I'd stick with it.