小马哥，为啥init时说不是内部外部命令？

SSL开启了,php5.5的

就停了，不提示输入用户名密码什么的

小马哥，我到了第6步时
D:\wamp\www\yii2\basic>php composer.phar create-project --prefer-dist --stabilit
y=dev yiisoft/yii2-app-basic ../yii2test
You are running composer with xdebug enabled. This has a major impact on runtime
performance. See https://getcomposer.org/xdebug
Installing yiisoft/yii2-app-basic (dev-master c8afc49aad4d82273156a155501fe9a1cc
3dd76c)

[InvalidArgumentException]
Project directory ../yii2test/ is not empty.

create-project [-s|--stability STABILITY] [--prefer-source] [--prefer-dist] [--r
epository REPOSITORY] [--repository-url REPOSITORY-URL] [--dev] [--no-dev] [--no
-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--keep-vcs] [
--no-install] [--ignore-platform-reqs] [--] [] [] [
]

D:\wamp\www\yii2\basic>