Upgrading concrete5 cms from php56 to php7

looking for one can upgrade concrete5 website from php56 to php 7 keep all the layout and website data images intact right now error messages are coming as below i think becasue hosting company upgraded server from php56 to php7 Warning: Declaration of Concrete5_Model_Page::add(CollectionType $ct, $data) should be compatible with Concrete5_Model_Collection::add($data) in /home/myrainbownursery/public_html/concrete/core/models/[login to view URL] on line 12 Warning: Declaration of Concrete5_Model_Page::duplicate($nc, $preserveUserID = false) should be compatible with Concrete5_Model_Collection::duplicate() in /home/myrainbownursery/public_html/concrete/core/models/[login to view URL] on line 12 Warning: Declaration of Concrete5_Model_EditPagePropertiesPagePermissionAccess::save($args) should be compatible with Concrete5_Model_PermissionAccess::save() in /home/myrainbownursery/public_html/concrete/core/models/permission/access/categories/custom/[login to view URL] on line 0 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/[login to view URL] on line 963 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/page_cache/[login to view URL] on line 40 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/page_cache/[login to view URL] on line 40 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/page_cache/[login to view URL] on line 40 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/page_cache/[login to view URL] on line 40 Warning: Cannot modify header information - headers already sent by (output started at /home/myrainbownursery/public_html/concrete/core/models/[login to view URL]) in /home/myrainbownursery/public_html/concrete/core/libraries/[login to view URL] on line 657 Please contact if you can or know this cheers