Can’t connect to HTTPS site using cURL. Returns 0 length content instead. What can I do?

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I had the same problem today.
Curl comes with an outdated file to authenticate HTTPS certificates from.

get the new one from:

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

save it into some dir on your site

and add 

curl_setopt ($curl_ch, CURLOPT_CAINFO, dirname(__FILE__)."/cacert.pem");

To every request 🙂

IGNORE any dumbass comments about disabling CURLOPT_VERIFYPEER and CURLOPT_VERIFYHOST!! That leaves your code vulnerable to man in the middle attacks!

December 2016 edit:

Solve this properly by using Jasen’s method mentioned below.

add curl.cainfo=/etc/ssl/certs/ca-certificates.crt to you php.ini

October 2017 edit:

There is now a composer package that helps you manage the ca certificates, so that you’re not vulnerable if your cacert.pem becomes outdated due to revoking certificates.

https://github.com/paragonie/certainty -> composer require paragonie/certainty:dev-master

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