Composer is an application-level package manager for the PHP programming language. It provides a standard format for managing with ease PHP-based project dependencies (libraries) and was strongly inspired by Node.js's "npm" and Ruby's "bundler". Composer was developed by Nils Adermann and Jordi Boggiano. They both continue to manage the project. Read more at https://getcomposer.org.

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Managing your dependencies manually in any programming language is a huge pain. This is why in most programming languages today you will find that they all have some implementation of a dependency management system or sometimes a package manger. Composer is the dependency management system that you will find inside most modern PHP projects.