Can I change php variables via .htaccess?
No, via .htaccess, you can't change php variables. But, you can changes php variables with the help of a .user.ini file. Create that file in the rootfolder of your Servage account and enter the desired settings into the file.
Please make sure not to enter too large values (exaggerated values won't be accepted by the host). You can check whether your individual settings are accepted by creating a new webpage (e.g. yourdomain.com/settings) and entering the follwing code in the new webpage: phpi...