composer ssl3_get_server_certificate:certificate verify failed

• 使用 composer命令
  composer self-update
  或
  composer require wechatpay/wechatpay

• 都出现以下问题：
  
  [Composer\Downloader\TransportException]
  The "https://getcomposer.org/versions" file could not be downloaded: SSL operation failed with code 1. OpenSSL Erro
  r messages:
  error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed
  Failed to enable crypto
  failed to open stream: operation failed

• composer使用了PHP命令进行操作，所以，需要开启openssl、配置证书
  证书下载地址：http://curl.haxx.se/ca/cacert.pem

• 配置php.ini这两项,注意换成自己的证书路径
  curl.cainfo ="c:/cert.pem"
  openssl.cafile = "c:/cert.pem"

• 再来一次 composer self-update ，运行不报错
  

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