Now you can change your PHP version from the .htaccess file in by browsing to it in DirectAdmin File Manager:
Find the file and put this lines of code:
< FilesMatch "\.(php4|php5|php3|php2|php|phtml)$" >
SetHandler application/x-lsphp71
< /FilesMatch >
Note: remove the spaces after and before "<" and ">"!
You have to change lsphp71 with whatever is needed to be as a PHP version and you are done.
We are all dedicated to improve our setups!