How to change the php version from 5.6 to 7.0 in 1C-Bitrix?

Question

1C-Bitrix

When I change from 5.6 to 7.0 on hosting, the site stops working and swears at errors.
Of course, there is an option to manually rewrite the lines with errors, but this is long and dreary.
Is there a quick update option? Can Bitrix itself be updated to a new version?
The project works on the basis of "1C-Bitrix: Site Management 16.0.11"

Answer 1

1) you need to update Bitrix to the latest version (this is done in the section of the market place in the admin panel)
2) Switch the version to 7.0 only 7.2 do not use Bitrix does not support it

Answer 2

SOLUTION:
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