cURL not working!

I am attempting to use cURL to integrate a form into awebber.com, which usually uses it's own dynamically generated forms to signup people to an opt-in list.

I am having a case of user error. I have created a class to POST the form variables to their url, but it doesn't appear to be working.

Code snippet 1: This form works, but is a straight HTML POSTed form.
Code snippet 2: This is the class I wrote, but it doesn't POST the variables correctly.

What is wrong with the class?

SNIPPET 1:
 
<form method="post" action="http://www.aweber.com/scripts/addlead.pl">
<input type="hidden" name="meta_web_form_id" value="1468401561">
    <input type="hidden" name="meta_split_id" value="">
    <input type="hidden" name="unit" value="jobhuntsuccess">
    <input type="hidden" name="redirect" value="http://www.aweber.com/form/thankyou_vo.html" id="redirect_89d25e6c2fded4b568b61d9895650a60">
    <input type="hidden" name="meta_redirect_onlist" value="">
    <input type="hidden" name="meta_adtracking" value="">
    <input type="hidden" name="meta_message" value="1">
    <input type="hidden" name="meta_required" value="from">
    <input type="hidden" name="meta_forward_vars" value="1"> 
<table><tr><td colspan=2><center><div>Uses http://www.guaranteedjobsystems.com/quiz/</div></center></td></tr><tr><td>Name:</td><td><input type="text" name="name" value="" size="20"></td></tr><tr><td>Email:</td><td><input type="text" name="from" value="" size="20"></td></tr>    <tr><td colspan=2><center></center></td></tr><tr><td align="center" colspan="2"><input type="submit" name="submit" value="Submit"></td></tr></table></form>
 
SNIPPET 2:
<?php
        //Uses cURL to send variables to aWebber.com to signup for a list.
class awebber {
 
        var $fields;
        var $values;
        var $ch;
        var $response;
        var $debug=false;
 
        function __construct($url = 'http://www.aweber.com/scripts/addlead.pl') {
                $this->fields = array();
                $this->values = array();
                $this->ch = curl_init($url);
//                curl_setopt($this->ch, CURLOPT_POSTFIELDS    ,$this->vars); //<-- Should be done in post_this instead.
//                curl_setopt($this->ch, CURLOPT_FOLLOWLOCATION  ,1);
//                curl_setopt($this->ch, CURLOPT_HEADER      ,0);  // DO NOT RETURN HTTP HEADERS
        }
 
        function add_var($field,$value) {
                //adds POST vars to the vars array
                //usage $x->add_var(field,value)
                array_push($this->fields,$field);
                array_push($this->values,$value);
        }
 
        function post_this() {
                //create array to hold variables
                $buffer = array();
 
                //Compile POST string
                for($i=0;$i<=sizeof($this->fields);$i++) {
                        $buffer[$i][0] = $this->fields[$i];
                        $buffer[$i][1] = $this->values[$i];
                }
 
 
                //executes the cURL post function.
//                curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: multipart/form-data"));
                curl_setopt($this->ch, CURLOPT_RETURNTRANSFER  ,1);  // RETURN THE CONTENTS OF THE CALL
                curl_setopt($this->ch,CURLOPT_POST,1);
                curl_setopt($this->ch, CURLOPT_POSTFIELDS    ,$this->build_url($fields,$values));
                $this->response = curl_exec($this->ch);
                if($this->debug) {
                        echo "<pre>";
                        print_r($this->build_url($fields,$values));
                        echo "</pre>";
                        echo $this->response;
                }
        }
 
        function build_url($fields,$values) {
                for($i=0;$i<=sizeof($fields);$i++) {
                        $buffer .= $fields[$i] . "=" . $values[$i];
                        if($i < sizeof($fields))
                        {
                                $buffer .= "&";
                        }
                }
                return urlencode($buffer);
        }
}

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