I have a while loop, with cUrl inside. (I can't use curl_multi for various reasons.) The problem is that cUrl seems to save the data it POSTS after each loop traversal. For instance, if parameter X is One the first loop through, and if it's Two the second loop through, cUrl posts: "One,Two". It should just POST "Two".(This is despite closing and unsetting the curl handle.)

Here's a simplified version of the code (with unecessary info stripped out):

while(true){

           // code to form the $url. this code is local to the loop. so the variables should be "erased" and made new for each loop through.

    $ch = curl_init();
    $userAgent = 'Googlebot/2.1 (http://www.googlebot.com/bot.html)';
    curl_setopt($ch,CURLOPT_USERAGENT, $userAgent);
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_POST,count($fields));
    curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
    curl_setopt($ch, CURLOPT_FAILONERROR, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_AUTOREFERER, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 10);
    $html = curl_exec($ch);
    curl_close($ch);
    unset($ch);

    $dom = new DOMDocument();
    @$dom->loadHTML($html);
    $xpath = new DOMXPath($dom);
    $resultTable = $xpath->evaluate("/html/body//table");
           // $resultTable is 20 the first time through the loop, and 0 everytime thereafter becauset he POSTing doesn't work right with the "saved" parameters. 

What am I doing wrong here?