codeigniter-data无法从模型中检索

I have successfully made a soap server using codeigniter. i want pass an array from model to controller. but i only get null. here my code:

Model:

       $this->db->select('player_item, count(*) as total');
       $this->db->from('rps'); 
       $this->db->group_by('player_item');
       $query = $this->db->get();
       $rows = array();
       foreach ($query->result_array() as $row)
       {
          $rows[] = $row;

       }
      return $rows; 

Soap server:

     function get_player(){
        $CI =& get_instance();
        $CI->load->model("player");
        $data['player']=$CI->player ->get_player();
        return $data;
}

Soap client:

$result = $this->nusoap_client ->call('get_player');
print_r($result);

i don't know my code at server correct or not. i am just new to SOAP..

try to write below of this line
$data['player']=$CI->player ->get_player();
echo '<pre>'; 
print_r($data);
echo '</pre>'; 
die;

and check weather you are getting data or not .if you are not getting data then var_dump($this->db->last_query());

and you can also check in model that you are getting data from database or not.

       $this->db->select('player_item, count(*) as total');
       $this->db->from('rps'); 
       $this->db->group_by('player_item');
       $query = $this->db->get();
       $rows = array();
       foreach ($query->result_array() as $row)
       {
          $rows[] = $row;

       }


echo '<pre>'; 
print_r($rows);
echo '</pre>'; 
die;

      return $rows; 

Add second parameter in select('fields', false) function false to skip automatic apostrophe on fields, CI automatic add apostrophe on mysql query fields, so when you use mysql function like count(*) then it will give you mysql error, your query will look like

SELECT `player_item`, `count(*)` as `total` ......

changes

$this->db->select('player_item, count(*) as total');

to

 $this->db->select('`player_item`, count(*) as `total`', false);