PHP cURL error code 60

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_cert\cacert.pem"

i fixed this by modifying php.ini file at C:\wamp\bin\apache\apache2.4.9\bin\

curl.cainfo = "C:/wamp/bin/php/php5.5.12/cacert.pem"

first i was trying by modifying php.ini file at C:\wamp\bin\php\php5.5.12\ and it didn't work.

hope this helps someone who is searching for the right php.ini to modify

php --ini

This will tell you exactly which php.ini file is being loaded, so you know which one to modify. I wasted a lot of time changing the wrong php.ini file because I had WAMP and XAMPP installed.

Also, don't forget to restart the WAMP server (or whatever you use) after changing php.ini.