How to install symfony using composer or symfony-installer?

First of all confirm that you have installed composer. 

Install using composer.

1. Open your command prompt.
2. Then go to your project directory.
3. Then write command to install symfony using composer.
4. Command to install symfony "composer create-project symfony/framework-standard-edition my_project_name"
5. Wait until symfony installs in your computer.

Install using symfony installer.

1. Open your command prompt.
2. Install symfony installer to install symfony setup.
3. Command for symfony installation  "composer global require symfony/symfony-installer"
4. Go to your project directory after completion of installation of symfony installer.
5. Then write command to install symfony.
6. Command for symfony setup "symfony new project_name".

Your installation has been complete.