PHP 7.0 not using the installed php-curl extension on Ubuntu 14

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I've installed PHP 7 after add-apt-repository ppa:ondrej/php and it's working fine alongside PHP 5.5.9, except for curl. Trying to install it with apt install php7.0-curl returns E: Couldn't find any package by regex 'php7.0-curl'.

Is there a way to install PHP 7 curl on Ubuntu 14, or get it to work with the existing php-curl meant for PHP 5.5.9?