Is there any way to install Composer globally on Windows?

Sure. Just put composer.phar somewhere like C:\php\composer.phar, then make a batch file somewhere within the PATH called composer.bat which does the following:

@ECHO OFF
php "%~dp0composer.phar" %*

The "%*" repeats all of the arguments passed to the shell script.

Then you can run around doing composer update all ya want!

This may be useful to someone:

On Windows 7, if you've installed Composer using curl, it can be found in similar path:

C:\Users\<username>\AppData\Roaming\Composer

Go to php.exe located folder.

C:\wamp\bin\php\php5.5.12\

open cmd there, and execute below command.

php -r "readfile('https://getcomposer.org/installer');" | php

composer.phar will be downloaded in same folder.

Create folder named composer in C:// drive (or anywhere you wish, for upcoming steps, remember the path).

move composer.phar file to C://composer folder.

Create composer.bat file in same folder with contents below

@ECHO OFF
php "%~dp0composer.phar" %*

create file named composer without any extensions.

running command type NUL > composer in CMD will help to get it done quickly,

Open that file and place below contents inside it.

#!/bin/sh
dir=$(d=$(dirname "$0"); cd "$d" && pwd)
# see if we are running in cygwin by checking for cygpath program
if command -v 'cygpath' >/dev/null 2>&1; then
    # cygwin paths start with /cygdrive/ which will break windows PHP,
    # so we need to translate the dir path to windows format. However
    # we could be using cygwin PHP which does not require this, so we
    # test if the path to PHP starts with /cygdrive/ rather than /usr/bin.
    if [[ $(which php) == /cygdrive/* ]]; then
        dir=$(cygpath -m $dir);
    fi
fi
dir=$(echo $dir | sed 's/ /\ /g')
php "${dir}/composer.phar" $*

Save.

Now set path, So we can access composer from cmd.

• Show Desktop.

• Right Click My Computer shortcut in the desktop.

• Click Properties.

• You should see a section of control Panel - Control Panel\System and Security\System.

• Click Advanced System Settings on the Left menu.

• Click Environment Variables towards the bottom of the window.

• Select PATH in the user variables list.

• Append your PHP Path (C:\composer) to your PATH variable, separated from the already existing string by a semi colon.

• Click OK

Restart your machine.

Or, restart explorer only using below command in CMD.

taskkill /f /IM explorer.exe
start explorer.exe
exit

Original Article with screenshots here : http://aslamise.blogspot.com/2015/07/installing-composer-manually-in-windows-7-using-cmd.html

Install Composer

On Windows, you can use the Composer Windows Installer.