getting error on uploading multiple images using codeigniter - php

Question

when uploading multiple images iam getting an error that the value of table is getting null while displaying..
here is my controler..
public function add_images()
{
$data['active_mn']='add_images';
$this->form_validation->set_rules('title','title','required');
$this->form_validation->set_rules('parentname','parent category','required');
$this->form_validation->set_rules('subname','sub category','required');
$this->form_validation->set_rules('code','code','required');
$this->form_validation->set_rules('description','Description','required');
$this->form_validation->set_rules('size','Size','required');
if($this->form_validation->run()==TRUE)
{
$image=array_values($this->session->userdata('image'));
$images=json_encode($image);
$data = array('title'=>$this->input->post('title'),
'code'=>$this->input->post('code'),
'select_image'=>$this->input->post('select_image'),
'select_wear'=>$this->input->post('select_wear'),
'image'=>$images,
'category_id'=>$this->input->post('subname'),
'size'=>$this->input->post('size'),
'description'=>$this->input->post('description'));
$product=$this->roxmodel->add_gallery($data);
if($product)
{
$data=array();
$colors=array_filter($this->session->userdata('colors'));
/*creating a multidiemensional array to batch insert*/
foreach ($colors as $color)
{
$new_array=array('product_id'=>$product,'color'=>$color);
array_push($data, $new_array);
}
$product=$this->roxmodel->add_product_color($data);
$this->session->unset_userdata('image');
$this->session->unset_userdata('colors');
$this->session->set_flashdata('message', 'Product added Successfully.');
redirect('admin_control/view_images');
}
else
{
//$this->session->unset_userdata('image');
$this->session->set_flashdata('message', 'Insertion Failed.');
redirect('admin_control/add_images');
}
}
//$this->session->unset_userdata('image');
//var_dump($data['sub_category']);
$data['parent']=$this->roxmodel->get_parentcategory();
$this->load->view('add_images',$data);
}
my view page is this...
<?php foreach ($detail as $row) { ?>
<div class="col-md-3 col-sm-1">
<?php $images = json_decode($row->image);
//print_r($images); ?>
<div class="image-box">
<!-- <textarea id="F<?php echo $row->id;?>" hidden> <?php echo $row->image;?></textarea>
<img width="100" src="<?php echo base_url()?>images/<?php echo $images[0] ?>" alt="" file="F<?php echo $row->id;?>" class="img-responsive view-more">
-->
<?php
if($images){
foreach($images as $image):?>
<img width="100" height="100" src="<?php echo base_url();?>images/<?php echo $image;?>" class="img-responsive" alt="">
<?php endforeach;
}
else
{
?>
<img width="100" height="100" src="<?php echo base_url();?>images/<?php echo $row->image;?>" class="img-responsive" alt="">
<?php
};
?>
<div class="edit-box">
<h4><?php echo $row->title; ?>
</h4>
<span class="rg-br" type="button">
<i class="fa fa-pencil-square-o" data-toggle="tooltip" data-placement="bottom" title="Edit"></i>
</span>
<span>
<a class="portfolio" data-toggle="modal" onclick='return deleteItem()' name="delete" id="title" img="img1446224811.jpg" big-img="" title="Delete" href="<?php echo base_url();?>admin_control/delete_image/<?php echo $row->id;?>/<?php echo $row->image;?>"><i class="fa fa-trash-o" data-toggle="tooltip" data-placement="bottom" title="Delete"></i></a></span>
<h5><!-- <?php echo $row->description; ?> --></h5>
</div>
</div>
</div>
<?php } ?>
here the image is not displaying and the value of image in table is getting null