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() error.
Now, my pages contain curl codes do not work.
In phpinfo(), it looks Curl is enabled.
There were similar questions but none of them handled it in php7.
I thought it should be something different than others.
When I try
php -i | grep curl
I've had similar problem with curl after upgrade to XX (16.04). After reinstalling curl with:
sudo apt-get install php-curl
And server restart
sudo service apache2 restart
everything went back to normal :)