Description:
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If curl_setopt() is used to set CURLOPT_POSTFIELDS with an array, it will not work unless CURLOPT_POST has been set to true first.

This works:

  $parameters = array("test" => "testing");
  curl_setopt($ch, CURLOPT_POST, TRUE);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $parameters);

This posts and empty form:

  $parameters = array("test" => "testing");
  curl_setopt($ch, CURLOPT_POSTFIELDS, $parameters);
  curl_setopt($ch, CURLOPT_POST, TRUE);

However, this works:

  $parameters = "test=testing";
  curl_setopt($ch, CURLOPT_POSTFIELDS, $parameters);
  curl_setopt($ch, CURLOPT_POST, TRUE);

It would be very helpful if a note was added in the documentation for  CURLOPT_POSTFIELDS that CURLOPT_POST must be set to true before passing an array or it will not be automatically converted to a query string.