Q:

Debian 9/Ubuntu: Which repository sources can I add to sources.list in order to get more up-to-date packages?

(I've already run apt-get update.)
I installed php from the default Debian repositories, but found that it's only version 7.0. This is now 4 years old, from 2015...
Last year, I had been developing a project using the most recent stable PHP version at the time (7.2), which I had installed with Homebrew. Now I'm trying to set up a Debian machine, but I cannot compile my projects because Debian's default packages are so old. I expect that I'll have issues with other obsolete packages as well, which is why I'm generalizing my question beyond PHP.
Is there a repository (or repositories) that I can add to my /etc/apt/sources.list file that will grant me access to more recent packages? Homebrew is able to find them, so it must be possible.

A:

Here you can find online repo list generator with a good explanation on each repo. read it for more info. by the way you need do what @JosephWorks said to get most recent packages.

