While i try to install composer.phar in my wamp server using command prompt i received below  error in my cmd. Composer is a tool for dependency management in PHP. It allows you to declare the dependent libraries your project needs and it will install them in your project for you. I used composer while install Symfony2.

Command to install composer using cmd :

php -r "eval('?>'.file_get_contents('https://getcomposer.org/installer'));"

Error :

D:\wamp\www\server>php -r "eval('?>'.file_get_contents('https://getcomposer.org/
installer'));"
PHP Warning: file_get_contents(): Unable to find the wrapper "https" - did you
forget to enable it when you configured PHP? in Command line code on line 1
PHP Stack trace:
PHP 1. {main}() Command line code:0
PHP 2. file_get_contents() Command line code:1
Warning: file_get_contents(): Unable to find the wrapper "https" - did you forge
t to enable it when you configured PHP? in Command line code on line 1
Call Stack:
 0.0059 116464 1. {main}() Command line code:0
 0.0059 116856 2. file_get_contents() Command line code:1
PHP Warning: file_get_contents(https://getcomposer.org/installer): failed to op
en stream: Invalid argument in Command line code on line 1
PHP Stack trace:
PHP 1. {main}() Command line code:0
PHP 2. file_get_contents() Command line code:1
Warning: file_get_contents(https://getcomposer.org/installer): failed to open st
ream: Invalid argument in Command line code on line 1
Call Stack:
 0.0059 116464 1. {main}() Command line code:0
 0.0059 116856 2. file_get_contents() Command line code:1

Solution :

Use http intend of https

So use below command :

php -r "eval('?>'.file_get_contents('http://getcomposer.org/installer'));"

You must see the the output like below :

Hope this helps!