Translate cURL command line into PHP cURL

Question

I need to translate this cURL command into PHP cURL code:

> curl --get 'https://api.twitter.com/1/followers/ids.json' --data
> 'cursor=-1&screen_name=somename' --header 'Authorization: OAuth
> oauth_consumer_key="key", oauth_nonce="nonce",
> oauth_signature="signature", oauth_signature_method="HMAC-SHA1",
> oauth_timestamp="timestamp", oauth_token="token", oauth_version="1.0"'
> --verbose

I have tried this, but it doesn't seem to work:

> $ch = curl_init();
> curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: OAuth oauth_consumer_key="key", oauth_nonce="nonce", oauth_signature="signature", oauth_signature_method="HMAC-SHA1", oauth_timestamp="timestamp", oauth_token="token", oauth_version="1.0"'));
> curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
> curl_setopt($ch, CURLOPT_VERBOSE, 1);
> curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
> curl_setopt($ch, CURLOPT_HTTPGET, 1);
> curl_setopt($ch, CURLOPT_URL, 'https://api.twitter.com/1/users/show.json?cursor=-1&screen_name=somename');
> $page = curl_exec($ch);
> curl_close($ch);

error i am getting

SSL certificate problem, verify that the CA cert is OK. Details: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed

however it works in the standard curl command

Answer 1

You need to provide curl with the certificate chain that will allow it to verify Twitter's SSL certificate as valid. To do this, download the requisite certificate signatures from here and save them into a plain file (I 'll assume you name it cacert.pem).

Then, before making the request, set CURLOPT_CAINFO to point to this file:

// assumes file in same directory as script
curl_setopt($ch, CURLOPT_CAINFO, 'cacert.pem');

It's also a good idea to explicitly enable SSL certificate verification instead of relying on default settings:

curl_setopt($ch, CURLOPT_VERIFYPEER, true);