The correct AddType for php is application/x-httpd-php
AddType application/x-httpd-php .php
AddType application/x-httpd-php-source .phps
Also make sure your php module is loaded
LoadModule php5_module modules/mod_php55.so
When you're configuring apache then try to view the page from another browser - I've had days when chrome stubbornly caches the result and it keeps downloading the source code while in another browser it's just fine.