卷曲错误(60)SSL证书:无法获得本地颁发者证书

I would like to connect to some API by SSL.

Already I have generated 5 files:

PROD.cert.pem
PROD.issuer.pem
PROD.chain.pem
PROD.csr
PROD.key

This is my php code:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,           $wsdl);
curl_setopt($ch, CURLOPT_SSLCERT,       getcwd() . '\PROD.cert.pem');
curl_setopt($ch, CURLOPT_SSLKEY, getcwd() . '\PROD.key');

$output = curl_exec($ch);

var_dump(curl_errno($ch));
var_dump(curl_error($ch));

So, as you can see I add two files: cert and key

When, I run this code I always got error:

SSL certificate problem: unable to get local issuer certificate

Do you know, what I do wrong? How can I resolve this error?

Certificates are not be included in your webdir, you need to install them on your webserver. You can find a comprehensive guide here