Want to validate POST arrays in bulk with FuelPHP

<input type="text" name="title[]"value=""> 
<input type="text" name="title[]"value=""> 
<input type="text" name="title[]"value="">

// Get input value
Session::set('inputs', Input::all());
$inputs=Session::get('inputs');
// Creating an instance of validation
$validate=Validation::forge();

foreach($inputs['title'] as $key=$value)
{
    $validate ->add("title[$key]", "[$value]th title") 
        ->add_rule('trim')//Remove spaces before and after
        ->add_rule('required')//Required
        ->add_rule('max_length',50);// Maximum number of characters entered
}
$validate ->run();
// This flash session does not appear on the screen, it is blank
Session::set_flash('error', $validate->show_errors());