I assume, that on DA is used lsphp handler by default.
1) Create /etc/container/php.handler with this:
application/x-lsphp52 /opt/alt/php52/usr/bin/lsphp application/x-lsphp53 /opt/alt/php53/usr/bin/lsphp application/x-lsphp54 /opt/alt/php54/usr/bin/lsphp application/x-lsphp55 /opt/alt/php55/usr/bin/lsphp
2) Restart apache
3) In location where You need to use specific php create .htaccess with:
AddType application/x-lsphp53 .php5 .php4 .php .php3 .php2 .phtml