How to insert radio, checkbox and textbox value in same variable post method name using codigniter?

my view page

 <form action="<?php echo base_url()?>Quiz/add_stu_ans" method="POST"> 
<label>Who is usa president</label>
<input type="text" name="answer[]">
<label>Dhoni is cricket player player</label>
<input type="radio" name="answer[]" value="True">True
<input type="radio" name="answer[]" value="False">False
<label>Which is asian country</lable>
<input type="checkbox" name="answer[]" value="newyork">newyork
<input type="checkbox" name="answer[]" value="india">india
<input type="checkbox" name="answer[]" value="srilanka">srilanka
</form>

My controller page

public function add_stu_ans()
{
$values['stu_answer']  = $this->input->post('ans');
$this->Common_model->insert_record('student',$values);
$this->session->set_flashdata('message_name' , 'Your Data is Inserted');
redirect('Quiz/question');
}

And this is model

public function insert_record($table,$values) {		
$this->db->insert($table,$values);
return $this->db->insert_id();	
}

please anyone can tell me how to customize the code in controller

Only possible if you take another hiddent text field where your 'qstn_id' will be in value. take this field in array.

in coding part while taking foreach loop you have to take qstn_id as in "[key]" format otherwise you cant find skipped records.

for eg. :

     foreach ($que as $key => $ansValue) {
$val2 = $ansValue[$key];
}
// $val2 store as your output.

This is code to save the data using json_encode. Let me know you get any error I have not run this code.

> View File

<form action="<?php echo base_url()?>Quiz/add_stu_ans" method="POST"> 
<label>Who is usa president</label>
<input type="text" name="usa_president">
<label>Dhoni is cricket player player</label>
<input type="radio" name="cricket_player" value="True">True
<input type="radio" name="cricket_player" value="False">False
<label>Which is asian country</lable>
<input type="checkbox" name="country[]" value="newyork">newyork
<input type="checkbox" name="country[]" value="india">india
<input type="checkbox" name="country[]" value="srilanka">srilanka
</form>

> Controller

public function add_stu_ans()
{
$usa_president = $this->input->post('usa_president');
$cricket_player= $this->input->post('cricket_player');
$country= $this->input->post('country');
$final_data = array(
'usa_president' => $usa_president,
'cricket_player' => $cricket_player,
'country' => $country,
);
$json_encode_data = json_encode($final_data);
$this->Common_model->insert_record('student',$json_encode_data);
$this->session->set_flashdata('message_name' , 'Your Data is Inserted');
redirect('Quiz/question');
}

Please check this at your end and time of fetch the data from the database then you need to pass that return data from the function json_decode.

$json_decode_data = json_decode($return_data_from_data_table);