Problems with PHP 7

Our host updated our servers PHP to version 7 and we have been having large issues with installing newest 8.3.2 version of concrete5 and also saving sessions to the server.

Does anyone know what could cause the following issues with 8.3.2 and PHP 7?

I am getting the following error in installation server check:
concrete5 cannot parse the PATH_INFO or ORIG_PATH_INFO information provided by your server.

For the sessions saving I get the following error which was resolved by changing sessions to database or defining another folder for sessions:
is_dir(): open_basedir restriction in effect. File(/var/lib/php) is
within the allowed path(s):

Our hosts infos are available in the following addresses:

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