php curl无法上传文件是因为php版本区别

if (version_compare("5.5", PHP_VERSION, "<")) {
    $postData['upload'] = new CURLFile('/tmp/1.jpg');
} else {
    $postData['upload'] = '@/tmp/1.jpg';
}

$url = "http://127.0.0.1:3000/upload";
$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER,true);
curl_setopt($ch, CURLOPT_POSTFIELDS,$postData);
curl_setopt($ch, CURLOPT_TIMEOUT, 3); 
curl_setopt($ch, CURLOPT_URL, $url);
$info= curl_exec($ch);
curl_close($ch);