post request and get xml response

Question

Code:

$url = 'example/'.$reqID.'/';

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_MUTE, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: text/xml'));
curl_setopt($ch, CURLOPT_POSTFIELDS, "$xml_data");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($ch);
      //var_dump($output);
curl_close($ch);

Error:

curl_setopt() [function.curl-setopt]: Invalid curl configuration option

Answer 1

the error can indicate that you try to use curl in an IPv6 enabled environment and don't tell curl to resolve over IPv4

try to set the option

curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);

Allows an application to select what kind of IP addresses to use when resolving host names. This is only interesting when using host names that resolve addresses using more than one version of IP, possible values are CURL_IPRESOLVE_WHATEVER, CURL_IPRESOLVE_V4, CURL_IPRESOLVE_V6, by default CURL_IPRESOLVE_WHATEVER.