在windows下运行composer却出现SSL报错：

E:\www>php -f composer.phar install
Loading composer repositories with package information
Installing dependencies (including require-dev)
SSL certificate problem, verify that the CA cert is OK. Details: 
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed”

没有安装CA证书导致的！！！

CA证书下载地址：

http://curl.haxx.se/docs/caextract.html

然后修改php.ini文件

openssl.cafile= D:/xampp/php-5.6/cacert.pem