Install PHP Composer Linux Mint 19
Hi! This tutorial will guide you step-by-step on How to Install PHP Composer on GNU/Linux Mint 19.x Tara/Tessa/Tina/Tricia LTS.
And Composer for Linux Mint 19 is a tool for dependency management in PHP. It allows you to declare the libraries your project depends on and it will manage (install/update) them for you.
Because Composer Manages Packages or Libraries on a Per-Project Basis, Installing them in a Directory Inside your Project.
Finally, the Guide include instructions on How to Getting-Started with Composer Basic Usage on Ubuntu Linux.

Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)In case first see: Terminal QuickStart Guide.