win7 64系统，wamp X64软件，安装Composer出现问题。
使用Composer-Setup.exe安装，报错如下
Connection Error [ERR_CONNECTION]: Unable to connect to http://getcomposer.org
解决方法：
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save ca-bundle.crt to your local path
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double click ca-bundler.crt to import it
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add the two line to php.ini
curl.cainfo=d:/download/ca-bundle.crt openssl.cafile=d:/download/ca-bundle.crt -
try to install composer-setup.exe agin.
作者：马小笃
链接：http://www.zhihu.com/question/22885542/answer/64443631
来源：知乎