Troubleshooting "HTTPS and SSL3_GET_SERVER_CERTIFICATE:certificate verify failed, CA is OK" Error

On XAMPP, users may encounter the error "cURL resource: SSL certificate problem, verify that the CA cert is OK" when attempting to access HTTPS-enabled sites after upgrading to version 1.7.3.

Verifying CA Certificate

Despite suggestions to use specific cURL options, the problem likely stems from a change in PHP installation or Apache settings. To resolve the issue, follow these steps:

Windows Solution:

1. Download cacert.pem from https://curl.se/ca/cacert.pem and save it in a convenient location.
2. Update php.ini by adding the line curl.cainfo = "PATH_TO/cacert.pem".

For PHP Versions Older Than 5.3.7:

For each cURL resource, set the CURLOPT_CAINFO option to the path of the cacert.pem file using the following syntax:

curl_setopt ($ch, CURLOPT_CAINFO, "PATH_TO/cacert.pem");

By verifying the CA certificate and setting the appropriate curl.cainfo option, you can resolve this error and restore proper HTTPS functionality.