PHP CURL POST Gönderimi hatam ne ?

<?php
 
 
function httpPost($url,$params) {
    $postData = '';
    foreach($params as $k => $v) {
        $postData .= $k . '='.$v.'&';
    }
    rtrim($postData, '&');
  
    $ch = curl_init();

    curl_setopt($ch,CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
curl_setopt($ch, CURLOPT_COOKIE, "__inst={'INSTANCE':'turkey','LANG':'tr','PLATFORM':'web','ENVIRONMENT':'production'};");
curl_setopt($ch,CURLOPT_USERAGENT,'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36 OPR/39.0.2256.48');
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_REFERER, 'https://www.example.com/landing');
    curl_setopt($ch,CURLOPT_HEADER, false);
    curl_setopt($ch, CURLOPT_POST, count($postData));
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
  
    $output=curl_exec($ch);

    curl_close($ch);
    return $output;
}
$params = array(
    "joinNowEmail" => "fantst342423etgmail.com",
    "joinNowPassword" => "sifrem45"
);
 
echo httpPost("https://www.example.com",$params);
?>