I'm trying to setup src for pmmp 1.2 but it needs composer how to run the composer on a Ubuntu 16.04 Server (64 bits). How to set it up etc...
First of all you have to checkout the thread itself here which is posted by dktapps. https://forums.pmmp.io/threads/pocketmine-mp-is-now-using-composer.3755/#post-35955 It has a link to the composer site and there you can see how you install it. https://getcomposer.org
If you have composer installed already and want to update to a newer version there is a link to that as well on the composer site. You will get with it no worries its not that hard anyways.