How to install Composer on Windows

Step 1: Download Composer-Setup

Step 2: Run Setup

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If you see the warning:

Some settings on your machine may cause stability issues with Composer.
If you encounter issues, try to change the following:

The OpenSSL library (0.9.8t) used by PHP does not support TLSv1.2 or TLSv1.1.
If possible you should upgrade OpenSSL to version 1.0.1 or above.

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You must upgrade OpenSSL after the installation of Composer. You can read this tutorial: How to upgrade OpenSSL from 0.9.8 to 1.0.1 on Windows

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Done, now, you can use Composer anywhere

C:\Users\Administrator>composer --help
  help [options] [--] [<command_name>]

  command                        The command to execute
  command_name                   The command name [default: "help"]

      --xml                      To output help as XML
      --format=FORMAT            The output format (txt, xml, json, or md) [defa
ult: "txt"]
      --raw                      To output raw command help
  -h, --help                     Display this help message
  -q, --quiet                    Do not output any message
  -V, --version                  Display this application version
      --ansi                     Force ANSI output
      --no-ansi                  Disable ANSI output
  -n, --no-interaction           Do not ask any interactive question
      --profile                  Display timing and memory usage information
      --no-plugins               Whether to disable plugins.
  -d, --working-dir=WORKING-DIR  If specified, use the given directory as workin
g directory.
  -v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for norma
l output, 2 for more verbose output and 3 for debug

 The help command displays help for a given command:

   php C:\ProgramData\ComposerSetup\bin\composer.phar help list

 You can also output the help in other formats by using the --format option:

   php C:\ProgramData\ComposerSetup\bin\composer.phar help --format=xml list

 To display the list of available commands, please use the list command.

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