Could not open input file: composer.phar

I am trying to install zendframework using composer tool in wamp server.

The following steps are done towards installation

1. I downloaded the Composer-Setup.exe file from composer page and got successfully installed.

2. I downloaded the zendframework and extracted inside the c:\wamp\www\zend folder

3. I executed the command for self update

   php composer.phar self-update

This line generates the error message: could not open file composer.phar

how to resolve this error

If I try the

composer.phar self-update

Use this :

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

This will install composer to the current directory so that you can use php composer.phar

The composer.phar install is not working but without .phar this is working.

We need to enable the openssl module in php before installing the zendframe work.

We have to uncomment the line ;extension=php_openssl.dll from php.ini file.

composer use different php.ini file which is located at the wamp\bin\php\php-<version number>\php.ini

After enabling the openssl we need to restart the server.

The execute the following comments.

I can install successfully using these commands -

composer self-update
composer install --prefer-dist

I was trying to install YII 2.0

php composer.phar create-project yiisoft/yii2-app-advanced advanced 2.0.0-alpha

I got the same error:

Could not open input file: composer.phar

Then i gave the full path of .phar like this:

php C:\ProgramData\Composer\bin\composer.phar create-project yiisoft/yii2-app-advanced advanced 2.0.0-alpha

and it worked.