从 packagist 更新时 Composer 更新失败

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failed https://packagist.org could not be fully loaded, package information was loaded from the local cache and may be out of date

我正在使用:

1. PHP 5.6.3 (cli)(构建时间:2014 年 11 月 17 日 15:16:53)
2. XAMPP 堆栈 5.6.3-0
3. Ubuntu 14.04

作曲家诊断显示:

Checking composer.json: OK
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity: FAIL
[ComposerDownloaderTransportException] 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
Checking disk free space: OK
Checking composer version: 

[作曲家下载器传输异常]
无法下载https://getcomposer.org/version"文件:SSL 操作失败，代码为 1.OpenSSL 错误消息:
错误:14090086:SSL 例程:SSL3_GET_SERVER_CERTIFICATE:证书验证失败
无法启用加密
无法打开流:操作失败

array(8) {
["default_cert_file"]=>
string(33) "/opt/lampp/share/openssl/cert.pem"
["default_cert_file_env"]=>
string(13) "SSL_CERT_FILE"
["default_cert_dir"]=>
string(30) "/opt/lampp/share/openssl/certs"
["default_cert_dir_env"]=>
string(12) "SSL_CERT_DIR"
["default_private_dir"]=>
string(32) "/opt/lampp/share/openssl/private"
["default_default_cert_area"]=>
string(24) "/opt/lampp/share/openssl"
["ini_cafile"]=>
string(0) ""
["ini_capath"]=>
string(0) ""
}