Call to undefined function curl_init() even it is enabled in php7

Question

I\'ve just installed php7 to my Ubuntu. At first, there was no problem, my web site was working. But suddenly, it started to return Call to undefined function curl_init() er

Answer 1

Scratched my head over this for a while, curl module was loaded but still got the error.
This happen after I upgraded from Debian Stretch to Buster.

The reason was that php7.3-curl was installed and used, but apache run php7.0 even though 7.3 was installed. So I removed php7.0 and reinstalled libapache2 to get it working

apt-get remove php-7.0
apt-get remove libapache2-mod-php7.3
apt-get install libapache2-mod-php7.3