Im totally lost ---upgraded to php 5.6 - now my wordpress sites only say "You have chosen to open"

hello. I have absolutely no idea how to fix this problem and would greatly value someones expertise with this problem.

CentOS Linux 6.9 I updated from php 5.3 to php 5.6 php -v says: PHP 5.6.32 (cli) (built: Oct 25 2017 07:00:59)

my problems is that if I go to any of my wordpress websites or click any dashboard links (dashboards open before php update to 5.6) there is this error popup.....

You have chosen to open xxx.php which is a php script from: http://any of my sites.com

what should firefox do with this file.

this same error pops up if I use IE, Chrome as well as firefox.

I'm only a begginer. After much searching i thought it might be a mime problem. went into webmin/apache/global settings/mime types

existing -- application/x-httpd-php phtml pht php I added: application/x-httpd-php56 phtml pht php (I thought to erase one of these mimes but no idea where to look to do it)

No success IM TOTALLY LOST NOW!

I have absolutely no idea how to fix this issue and I cant find anything in relation to this error anywhere! If it cant be fixed i will have to try and figure out how to revert back to php 5.3

I would gratefully appreciate some guidance on how to solve this problem.

Thanks Glen