how to send json format as input and store in database in codeigniter rest for webservices

Question

am using the following code for sending json format as input and to store it in db. when i decode the value am getting nothing. what was wrong in my code. can someone help me please.

controller

function join_community_post(){
        $serviceName = 'join_community';    
        //getting posted values
        $c =  '{"community" : [{"community_id":1},{"community_id":2},{"community_id":3}]}';
        $ip = trim($this->input->post($c));
        $ipJson = json_decode($ip);
        print_r ($ipJson);exit;
        $retVals = $this->user_model->user_join_community($ip, $serviceName);

        header("content-type: application/json");
        echo $retVals;
        exit;
    }

model

function user_join_community($ip,$serviceName) {
        $ipJson = json_decode($ip);
    }

Answer 1

The json_decode gives the stdClass Object if second parameter is not passed as true PHP:json_decode

And second you are passing the post value of $c...check if its blank Input Class

Controller

   function join_community_post(){
    $serviceName = 'join_community';    
    //getting posted values
    //$c =  '{"community" : [{"community_id":1},{"community_id":2},{"community_id":3}]}';
    $ip = trim($this->input->post($c));
    $ipJson = json_encode($ip);

    $retVals = $this->user_model->user_join_community($ip, $serviceName);

    header("content-type: application/json");
    echo $retVals;
    exit;
}

Model

 function user_join_community($c,$serviceName) {
         $ipJson = json_decode($c,true);
         $createArray = array();
         foreach($ipJson['community'] as $key=>$value){
           $createArray = array(
             'user_community_created_date' => date('Y-m-d H:i:s'),
             'user_community_modified_date' => date('Y-m-d H:i:s'),
             'community_id' => $value['community_id'] 
          );
      $insert = $this->db->insert('user_community', $createArray);
   }
   if ($insert) {
         $data['message'] = 'success';
         $status = $this->ville_lib->return_status('success', $serviceName, $data, $c);
    } else {
        $data['message'] = 'Error';
         $status = $this->ville_lib->return_status('error', $serviceName, $data, $c);
    }

  }

Removed semicolon after curly bracket of foreach and added the $c to the webservices table which was getting you the error.....hope it helps...