解决Win7下运行php Composer出现SSL报错的问题

以前都在linux环境使用php composer。今天尝试在win7下运行composer却出现SSL报错：

D:\data\www\mmoyu\symapp>php -f %phprc%\composer install
Loading composer repositories with package information

  [Composer\Downloader\TransportException]
  The "https://packagist.org/packages.json" file could not be downloaded: SSL
   operation failed with code 1. OpenSSL Error messages:
  error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify
  failed
  Failed to enable crypto
  failed to open stream: operation failed

install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-p
lugins] [--no-custom-installers] [--no-scripts] [--no-progress] [-v|vv|vvv|--ver
bose] [-o|--optimize-autoloader]

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:/wamp/php/verify/cacert.pem

就OK了~