发送企业回话信息，无法获取返回值

想通过内部系统发消息给钉钉用户，看了帮助写了下面的代码，运行后，用户接收不到消息，并且不管对错，都没有返回提示，怎么回事？？





$data = array("touser"=>“10”,"agentid"=>"41111","msgtype"=>"text","text"=>array( "content"=>"test"));    
                      
$data_string = json_encode($data);        
$url="https://oapi.dingtalk.com/message/send?access_token=".$accessToken ;                              
                          
$ch = curl_init();  
curl_setopt($ch, CURLOPT_POST,true);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,true);
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_POSTFIELDS,$data_string);
curl_setopt($ch, CURLOPT_HTTPHEADER,array("Content-Type: application/json","Content-Length:".strlen($data_string)));        
                                                                                        
$result = curl_exec($ch);
echo $result;