Conversion from CURL to PHP Curl - php

Question

I am running the below Curl request and it's working.
curl -v --cert /path/to/certs/myCert.crt --key /path/to/key/myKey.key --cacert /path/to/chainedcerts/intermediary.pem https://mysite:30009/
Converting it to php as below and it's failing with error 77 with no narration. I am thinking probably file permissions could be the issue. I am using nginx and the 3 certs are owned by nginx user. If there is any other way I can view the error description as I can see the other errors
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch,CURLOPT_POST,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, "xmlRequest=" . $xml);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 300);
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Expect:','Content-Type: text/xml']);
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_SSLCERT, "/path/to/certs/myCert.crt");
curl_setopt($ch, CURLOPT_SSLKEY, "/path/to/key/myKey.key");
curl_setopt($ch, CURLOPT_CAINFO, "/path/to/chainedcerts/intermediary.pem ");
curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
$data = curl_exec($ch);
$httpcode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
Log::error($httpcode .' : '. curl_errno($ch) .' : '. curl_error($ch));
curl_close($ch);