What is the best way to install php7 and from where?

Question

linux

Someone installs PHP7 from sources under Debian8 https://codebeer.ru/ustanovka-php-7-v-debian-8/ many people install from the Dotdeb repository, but let's say this option does not suit me.
Regarding the official repositories for OS, for example Debian: php7 was released a long time ago, but on the site with the official debian repositories https://wiki.debian.org/en/SourcesList nothing is searched in the search for php7 or am I looking in the wrong place?
It’s not clear with the keys, someone installs some GNU PG keys, someone doesn’t install them, it’s not clear at all whether they are needed or not and for what.

Answer 1

I use ondrej