正如刚才杰里米·林德布洛姆在意见，为解决 AWS SDK V2 是设置实例的SDK时， ssl.certificate_authority 选项：

As mentioned by Jeremy Lindblom in the comments, the solution for AWS SDK v2 is to set the ssl.certificate_authority option when instantiating the SDK:

$aws = Aws\Common\Aws::factory(array(
    'region' => 'us-west-2',
    'ssl.certificate_authority' => '/path/to/updated/cacert.pem'
));

http://docs.aws.amazon.com/aws-sdk-php/guide/latest/faq.html#what-do-i-do-about-a-curl-ssl-certificate-error

我要补充一点，这是在改变了的 AWS SDK V3 ，这里是新的方法：

I'll add that this was changed in the AWS SDK v3, here is the new method:

$client = new DynamoDbClient([
    'region'  => 'us-west-2',
    'version' => 'latest',
    'http'    => [
        'verify' => '/path/to/my/cert.pem'
    ]
]);

的http://docs.aws.amazon.com/aws-sdk-php/v3/guide/guide/configuration.html#verify