Beware of CURLE_* constants!
On the official site:
http://curl.haxx.se/libcurl/c/libcurl-errors.html
some constants are different, some missing compared to the PHP implementation.
Some examples:
in PHP the curl error number 28 is called
CURLE_OPERATION_TIMEOUTED
while in the official site is:
CURLE_OPERATION_TIMEDOUT
So if you use the second, it won't march the error 28 because in PHP it is not defined that way.
The same is for these:
CURLE_HTTP_RETURNED_ERROR
CURLE_UPLOAD_FAILED
CURLE_INTERFACE_FAILED
CURLE_SSL_CERTPROBLEM
CURLE_SEND_FAIL_REWIND
CURLE_LOGIN_DENIED
CURLE_AGAIN
that are in someway named differently or missing from PHP.