I been having problems with php extensions not working, php7.0 has the most problems its missing files even after you install it, for example its missing the module mbstring in /etc/php/7.0/mods-available/mbstring.ini and its also missing /usr/lib/php/20151012/mbstring.so

so i disabled php7.0 and enabled php7.3 and its working better now but i keep getting an error message from one of my applications saying php-gd is not installed but i do have it installed and using php7.3 -m shows the php-gd extension is also enabled so i cant figure out why its telling me its not installed i just been having a bunch of problems with the php extensions lately i would really appreciate any help you could give me.

apt-get update
apt-get install php7.3 php7.3-gd php7.3-zip php7.3-curl php7.3-mbstring -y
phpenmod -v 7.3 gd
phpenmod -v 7.3 zip
phpenmod -v 7.3 curl
phpenmod -v 7.3 mbstring
php7.3 -m

After doing that you will see the php extension is installed and enabled but its not working properly.

Thanks!