Server Side Validation in Codeigniter and Core PHP

// for server side validation to check all parameters are empty or not, if one parameter value is empty it return false start
        foreach ($this->input->post() as $key => $val){
                $inputArr[$key] = $val;
                unset($inputArr['referid']);
       
        }
    /*foreach ($_POST as $key => $val){ // for core php
                $inputArr[$key] = $val;
        }*/

        foreach($inputArr as $key1 => $value){
            if(empty($value))
            {  
                $response = array( 'status' => 'FALSE', 'message' => 'Some parameters are missing values');
                $this->set_response($response);
                die;
            }
  
        }
        // for server side validation end

**************************** END************************************

**************************** START**********************************
Using jQuery can set the session:
Using Jquery can set the session --> sessionStorage.setItem("rf_possesion",possesion);
get the session name --> sessionStorage.getItem("rf_possesion");
**************************** END************************************

**************************** START**********************************
POSTMAN form submit capture the form post data in controller:
$data = json_decode(file_get_contents("php://input"));

and print the data like this:

echo $data->username;
**************************** END************************************