安装 composer SSL operation failed with code 1

gavin@webdev:~> curl -sS https://getcomposer.org/installer | php

Downloading...
Download failed: file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
file_get_contents(): Failed to enable crypto
file_get_contents(https://getcomposer.org/composer.phar): failed to open stream: operation failed
Downloading...
Download failed: file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
file_get_contents(): Failed to enable crypto
file_get_contents(https://getcomposer.org/composer.phar): failed to open stream: operation failed
Downloading...
Download failed: file_get_contents(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
file_get_contents(): Failed to enable crypto
file_get_contents(https://getcomposer.org/composer.phar): failed to open stream: operation failed
The download failed repeatedly, aborting.

 

解决：

wget http://curl.haxx.se/ca/cacert.pem
curl -sS https://getcomposer.org/installer | php -- --cafile=cacert.pem