need autofill function in view

The easiest way is to gather all the field data you need in the controller and then pass it to the view.

Assuming the controller calls a model that returns a $user_data object like this

PHP Code:

$data['first_name'] = $user_data->first_name;
$data['last_name'] = $user_data->last_name;
$this->load->view("some_view", $data); 


Then in the view

PHP Code:

<?= form_input([
    'name' => 'first_name',
    'type' => 'text',
    'style' => 'text-transform:capitalize',
    'class' => 'form-control',
    'placeholder' => 'Enter your first name'], 
    'value' => set_value('first_name', $first_name)]); 
?>

Use the same idea for the last_name field.

PHP Code:

<?= form_input([
    'name' => 'last_name',
    'type' => 'text',
    'style' => 'text-transform:capitalize',
    'class' => 'form-control',
    'placeholder' => 'Enter your last name'], 
    'value' => set_value('last_name', $last_name)]);
?>