이번달 가져오기 오류

<?php


$ch = curl_init();
$url = 'http://apis.data.go.kr/B090041/openapi/service/SpcdeInfoService/getRestDeInfo'; /*URL*/
$today = date('Y-m-d');
$ss = date('Y');
$ss1 = date('04');
$queryParams = '?' . urlencode('serviceKey') . '=XOF2kmoeLs09B60ccCpdjBDu1aTUM9RQRyLfgJPxV3Z0TPmpnj1NtbwTssTQxLVHMqo3suOmDb8b%2BDat9%2FihPw%3D%3D'; 
$queryParams .= '&' . urlencode('solYear') . '=' . urlencode($ss); 
$queryParams .= '&' . urlencode('solMonth') . '=' . urlencode($ss1);


curl_setopt($ch, CURLOPT_URL, $url . $queryParams);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HEADER, FALSE);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
$response = curl_exec($ch);
curl_close($ch);

 $xml = simplexml_load_string($response);

            foreach ($xml->body->items->item as $item) {
                $key = substr($item->locdate,0,4).'-'.substr($item->locdate,4,2).'-'.substr($item->locdate,6,2);
                $val = $item->dateName.'';
                $isholi = $item->isHoliday.'';


                $display[] = array(
                    'date' => $key
                    , 'name' => $val
                    , 'isholi' => $isholi
                );
            }

$today = date('Y-m-d');
$ho = 0; // 기본값은 공휴일 아님

foreach ($display as $holiday) {
    if ($holiday['date'] == $today) {
        $ho = $holiday['isholi']; // 공휴일이면 Y, 아니면 0
        break;
    }
}

echo "<pre>";
print_r($ss);
echo "</pre>";
echo "<pre>";
print_r($ss1);
echo "</pre>";
echo "<pre>";
print_r($ho);
echo "</pre>";

?>