响应在PHP中为null，while.网络正在提供所有文本

我在PHP中使用cURL来获取响应中的id，但得到的响应为空。这是我的代码：

$jsonContent = "{'"param1'" : [{'"subparam1'" : subnumval1,'"subparam2'" : subnumval2 },{'"subparam1'" : subnumval1,'"subparam2'" : subnumval2 }],'"param2'" : '"val2'",'"param3'" : '"val3'"}";
    $url = HTTPS_URL;    
    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
    curl_setopt($ch, CURLOPT_USERPWD, "user:pass");
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");  
    curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonContent);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array(                                                                          
    'Content-Type: application/json',                                                                                
    'Content-Length: ' . strlen($jsonContent))
);
    $output = curl_exec($ch);
if($output === false)
{
       echo 'Curl error: ' . curl_error($ch);
}else
    {
       echo $output;
    }

当我尝试使用获得响应时。NET（C#），我得到了响应，这里是。NET代码：

public partial class PostData : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
            PostBlockFaceData();
    }
    // POST a JSON string
    void PostBlockFaceData()
    {
        //Create the credentials cache as you can more than one
        CredentialCache tempCache= new CredentialCache();
        //Create the Network username and password
        NetworkCredential secureCred = new NetworkCredential("user", "pass");
        //Add the login credentials to the credential cache
        parkmeCache.Add(new Uri("HTTPS_URL:443/"), "Basic", secureCred);
        //JSON array in string format
        string jsonContent = "{'"param1'" : [{'"subparam1'" : "subval1",'"subparam2'" : "subval2" },{'"subparam1'" : "subval2",'"subparam2'" : "subparam2" }],'"param2'" : '"val2'",'"param3'" : '"val3'"}";
        //
        string url = HTTPS_URL
        //Create the Webrequest with the URL
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        request.PreAuthenticate = true; //use authentication
        request.UseDefaultCredentials = true; //Use the default credential available
        request.Credentials = parkmeCache; //pass the credential cache to the request object
        //The following is to used to ignore bit matching
        System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate(
                    Object sender1,
                    X509Certificate certificate,
                    X509Chain chain,
                    System.Net.Security.SslPolicyErrors sslPolicyErrors)
        {
            return true;
        };

        request.Method = "POST"; //HTTP VERB
        request.ContentLength = jsonContent.Length; //JSON DATA string length
        request.ContentType = @"application/json"; //The Content type is of application in json format
        System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding(); //specified UTF8 standard text coding
        Byte[] byteArray = encoding.GetBytes(jsonContent); //converted the json data to bytes because datastream understands that way
        using (Stream dataStream = request.GetRequestStream()) //get the request stream handle
        {
            dataStream.Write(byteArray, 0, byteArray.Length);  //write the json data to the request stream
        }
        long length = 0;
        string strStatusCode="";
        string strDesc = "";
        try
        {
            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) //execute the request and get the response from the call
            {
                length = response.ContentLength; //length of the content
                strStatusCode = response.StatusCode.ToString(); //return the status code OK on success or status error codes like 400, 403 etc.,
                strDesc = response.StatusDescription; //The description has the return value in this case on success returns the Block Face ID
                Response.Write("Status Code : " + strStatusCode + "    ,    Status Description : " + strDesc);
            }
        }
        catch (WebException ex)
        {
            Response.Write(ex.Message);
            // Log exception and throw as for GET example above
        }
    }

}

上面的代码运行得很有魅力。。我不知道PHP的问题在哪里。有人能帮我吗？