Table of Contents
✅ Initialize a New Project
? Add Dependencies
?️ Project Structure Basics
? Final Steps
Home Development Tools composer How to start a new project with Composer?

How to start a new project with Composer?

Jul 30, 2025 am 03:46 AM
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To start a new project, first run composer init to initialize the project and configure the composer.json file, then enter the project name, description, author, stability, license and other information according to the prompts. Then use composer require to add the required dependencies such as monolog/monolog, or use composer create-project to create framework-based applications such as Laravel. Then make sure that the project contains composer.json, composer.lock and vendor/director, and introduce vendor/autoload.php in index.php to enable automatic loading. Set PSR-4 automatic loading such as "MyApp\": "src/", then run composer dump-autoload to update the autoloader, and finally execute composer install the dependency, submit composer.json and composer.lock to version control, and at the same time, add vendor/add.gitignore to avoid submitting dependency files, and complete project initialization.

How to start a new project with Composer?

Starting a new project with Composer is straightforward and sets up a solid foundation for managing dependencies in PHP projects. Here's how to do it step by step.

How to start a new project with Composer?

✅ Initialize a New Project

Open your terminal and navigate to your project directory. Run:

 composer init

This command starts an interactive wizard that helps you set up your composer.json file.

How to start a new project with Composer?

You'll be asked to provide:

  • Project name (eg, your-username/project-name )
  • Description
  • Author (usually in format Name <email> )
  • Minimum stability (default is stable )
  • License (eg, MIT )
  • Whether to require any dependencies now

Answer each prompt. You can press Enter to accept defaults.

How to start a new project with Composer?

? Add Dependencies

Even if you skip adding packages during init , you can add them later. For example:

 composer requires monolog/monolog

This installs the Monolog library and updates both composer.json and composer.lock .

If you're building a framework-based app (like Laravel or Symfony), you might instead use a project installer:

 composer create-project laravel/laravel my-new-app

This creates a new directory my-new-app with the Laravel framework already installed.


?️ Project Structure Basics

After initializing, your project should have:

  • composer.json – your project config and dependencies
  • composer.lock – exact versions of installed packages (generated after install)
  • vendor/ directory – where dependencies are installed (after composer install )

If you're starting from scratch, create your main PHP file (eg, index.php ) and autoload classes using Composer:

 require_once &#39;vendor/autoload.php&#39;;

Composer automatically sets up PSR-4 or PSR-0 autoloading if you define it in composer.json . Example:

 "autoload": {
    "psr-4": {
        "MyApp\\": "src/"
    }
}

Then run:

 composer dump-autoload

To regenerate the autoloader (especially useful during development).


? Final Steps

  1. Run composer install to install dependencies (useful when cloning the project later).
  2. Commit composer.json and composer.lock to version control (eg, Git).
  3. Add vendor/ to .gitignore to avoid committing dependencies.

That's it. You've got a Composer-powered PHP project up and running. From here, add packages as needed and organize your code with proper autoloading.

Basically just init , require , and autoload — and you're good to go.

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