Problem input array

[eluser]Thiago Leao[/eluser]
Hi guys!!!

I'm having a problem with array.
I is a description with several inputs, and want to update all at once.

Code:

<?
echo form_open(base_url().'administracao/cad_produto/alterarDesc');
                    foreach($produtos as $item):
                ?>                      
                <li>
                    <a >imagem;?&gt;" rel="lightbox">
                        &lt;?php echo img(array('src' => $item->thumb, 'alt' => $item->descricao, 'title' => $item->descricao));?&gt;
                    </a>
                    
                    <div class="itens_form">
                    
                        &lt;?php    
                            echo form_hidden('id_pictures[]', $item->id_pictures);
                            echo form_hidden('id_products', $item->id_products);
                            
                            echo form_label('', 'descricao')."\n";
                            echo form_input('descricao[]', $item->descricao);
                        ?&gt;
                        
                        <a >id_pictures; ?&gt;/&lt;?php echo $item->id_products; ?&gt;" onClick="return(deleta());" title="Apagar">
                            &lt;?php echo img(array('src' => 'assets/admin/images/apagar.png', 'alt' => 'Apagar'));?&gt;</a>
                      
                        
                    </div>
                    
                </li>
                &lt;?php
                    endforeach;
                    echo '<li>'.form_submit('mysubmit').'</li>';
                    echo form_close();

controller

Code:

function alterarDesc(){
            
            
            for($i=0; $i<count($_POST['descricao']); $i++){
            
                $data['descricao']         = $this->input->post('descricao');
                $data['id_products']     = $this->input->post('id_products');
                $data['id_pictures']     = $this->input->post('id_pictures');
                
                $this->load->model('administracao/cad_produto_model');        
                $this->cad_produto_model->alterarDesc($data);
            }
            
            redirect(base_url().'administracao/cad_produto/upload/'.$data['id_products'], 'refresh');    
        
    }

Error

Error Number: 1054

Unknown column 'Array' in 'field list'

UPDATE `pictures` SET `descricao` = Array, `id_products` = '37', `id_pictures` = '153' WHERE `id_pictures` = '153'

Can someone help me?
thanks!