codeIgniter update data based on search - php

Question

Based on search a form wiill be displayed with data based on search . I want to update this data with a button on the search result page. the update doesn't work and when I use var dump null values are returned
please help me out
view:
<h3> Allowances: </h3>
<div class='panel panel-info'>
<div class='panel panel-heading'></div>
<?php foreach ($allowance as $data): ?>
<div class="form-group">
<?php echo form_label( $data->name); ?>
<?php echo form_input(['class' => 'form-control', 'name' => 'amount','value' => $data->amount]); ?>
<?php echo form_hidden(['class' => 'form-control', 'name' => 'emp','value' => $data->emp_id]); ?>
<?php echo form_hidden(['class' => 'form-control', 'name' => 'comp','value' => $data->comp_id]); ?>
</div>
<?php endforeach; ?>
</div>
<a href='<?php echo base_url('payroll/update') ?>' class="btn btn-primary" type='submit'> Update</a>
COntroller
public function update(){
$emp_id = $this->input->get('emp');
$comp_id =$this->input->get('comp');
$d = [
'amount' =>$this->input->post('amount')
];
$this->payroll_model->update($d,$emp_id,$comp_id);
var_dump($d);
$this->session->set_flashdata('success','Successfully updated');
}
model
public function update($d,$emp_id,$comp_id){
// $array = array('emp_id'=>$emp_id,'comp_id' =>$comp_id);
// $this->db->where($array);
$this->db->where('emp_id',$emp_id);
$this->db->where('comp_id',$comp_id);
$this->db->update('emp_sal',$d);
return true;
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Answer 1

The reason why you are getting null values returned is that the line below redirects to the link in href instead of posting user's inputs
<a href='<?php echo base_url('payroll/update') ?>' class="btn btn-primary" type='submit'> Update</a>
To overcome this issue, use a form tag with action attribute that has the value of
base_url('payroll/update')
Such as the following
<?php echo form_open(base_url('payroll/update'), array('method'=>'post')) ; ?>
Replace the a tags you are using with the following input that submits user values instead of just redirecting with null values
<input class="btn btn-primary" type='submit'> Update</input>