[SOLVED] Get certain data from $_POST from a dinamic form

[eluser]Juan Velandia[/eluser]
Hello everyone, I would like to ask for your help. I have created a form created from records in a data base table named ITEMS

The view:

Code:

echo form_open('item/print');
foreach ($items as $item)
     {    
      echo form_checkbox($item->id_item, $item->name_item);
      }
echo form_submit('submit', 'Submit selected items');
echo form_close();

I check some of the check boxes that I want and send the form to the controller:

The controller

Code:

$post = array();
foreach ( $_POST as $key => $value )
  {
    $post[$key] = $this->input->post($key);
  }

  print_r($post);

The problem is that I need to put into the $post array ONLY the values $item->id_item of the selected items in the form, but I also get the SUBMIT value within the array

What can I do, I dont want to use a if(!$key==submit) within the loop. Any ideas or previous thread will be highly appreciated!