composer SSL 错误解决办法

composer self-update

报如下错误：

  [Composer\Downloader\TransportException]
  The "https://getcomposer.org/version" 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

是因为没有找到ssl证书, 解决办法：

1、下载证书
curl http://curl.haxx.se/ca/cacert.pem -o /usr/local/ssl/cert.pem

2、配置 php.ini ，指定证书的路径
openssl.cafile=/usr/local/ssl/cert.pem

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