安装过程中报错：The openssl extension is missing, which means that secure HTTPS transfers are impossible. If possible you should enable it or recompile php with --with-openssl
解决方法：找到path php路径下的php.ini，去掉;extension=php_openssl.dll前面的分号，重新安装成功。
The openssl extension is missing--composer install
原文：http://my.oschina.net/netmouse/blog/385189