Salesforce web to lead via php-curl.

gistfile1.php

$sfurl = 'https://www.salesforce.com/servlet/servlet.WebToLead?encoding=UTF-8';
$sffields = array(
                        'oid' => 'someoid',
                        'lead_source' => 'my website',
                        'last_name' => urlencode($_POST['name']),
                        'company' => urlencode($_POST['organization']),
                        'email' => urlencode($_POST['email']),
                        'phone' => urlencode($_POST['phone']),
                );
foreach($sffields as $key=>$value) { $fieldstring .= $key.'='.$value.'&'; }
rtrim($fieldstring, '&');

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $sfurl);
curl_setopt($ch, CURLOPT_POST, count($sffields));
curl_setopt($ch, CURLOPT_POSTFIELDS, $fieldstring);
$result = curl_exec($ch);
curl_close($ch);