PHP cURL error code 60

Whilst trying to setup a php environment on windows (using wamp) to use the Amazon PHP SDK, when i try to run a sample test I get the following error:

Fatal error: Uncaught exception 'cURL_Exception' with message 'cURL resource: Resource id #10; cURL error: SSL certificate problem: unable to get local issuer certificate (cURL error code 60). See http://curl.haxx.se/libcurl/c/libcurl-errors.html for an explanation of error codes.' in C:wampwwwAWSSDKforPHPlibrequestcorerequestcore.class.php on line 848

I have already added the following line to my php.ini

curl.cainfo = C:Windowsca-bundle.crt

which is the location of a certificate i created using this VBS script VBS-Script

I have restarted my WAMP service also.

Answer

Use this certificate root certificate bundle:

https://curl.haxx.se/ca/cacert.pem

Copy this certificate bundle on your disk. And use this on php.ini

curl.cainfo = "path_to_certcacert.pem"