How to Fix 'Unable to get local issuer certificate' Errors in PHP Curl?

Troubleshooting PHP Curl SSL Certificate Errors

Question:

When attempting to utilize PHP's Mandrill API, you encounter an SSL-related error: "Unable to get local issuer certificate." Despite implementing suggested solutions like adding curl.cainfo to php.ini, the issue persists.

Answer:

To resolve this error, follow these detailed instructions:

1. Acquire Certificate Bundle: Download the certificate bundle from [curl.haxx.se](http://curl.haxx.se/docs/caextract.html).
2. Place Certificate: Save the certificate in an accessible location, such as c:wamp or c:wamp64.
3. Enable Necessary Modules: Ensure that mod_ssl is enabled in Apache and php_openssl.dll is uncommented in both php.ini files - one accessible via the WAMP taskbar icon and the other usually located at C:wampbinphpphp5.5.12.
4. Set Openssl Path: Add the following lines to both php.ini files, replacing the paths with the actual location of the certificate bundle:

curl.cainfo="C:/wamp/cacert.pem"
openssl.cafile="C:/wamp/cacert.pem"

5. Restart Services: Restart all services to initiate the changes.

By following these steps, you can effectively resolve SSL certificate errors and ensure uninterrupted operation of PHP curl-based applications.

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