The openssl extension is missing, when install Composer?
In My Case :
You need to enable the openssl extension: Follow below steps.
Go to C:\wamp\bin\php\php5.4.16\php.ini that is the php configuration file that has it type has "configuration settings" with a driver-notepad like icon.
open it with notepad for openssl and search php_openssl.dll.
There is a semi-colon before the openssl extension :- ;extension=php_openssl.dll
remove the semi-colon and you'll have "extension=php_openssl.dll"
save the file and restart your WAMP server.
Now Re-install the Composer.
