I’m eagerly told everyone to upgrade there apps from CI 2 to CI 3, beside it supports latest PHP. It has ability to use Composer autoloader, as PHP ecosystem nowadays created every PHP libraries framework-agnostic (can be used in any PHP framework).
since the coding style of CI 3 still the same as before, so we need a little adjustment to use PHP class from composer. I call it a wrapper so it can be used in CI 3’s style.
You can look my simple wrapper for Dompdf: Dompdfy.