数组到字符串转换PHP

Any body can help me? I using MVC. This is my model code:

function activatedNode($node_id){ //to activated selected node
        $data = array (
            'active' => 1
        );
        $this->db-> where ('node_id', "'.$node_id.'"); //here is error line
        $this->db-> update ('node',$data);     
}

This is my controller code:

function resultRuang(){
    $ruang = $this-> input -> post('ruang');
    $node = $this->search3d -> ambilNodeID($ruang);
    $this->search3d -> nonactivatedNode();
    $this->search3d -> activatedNode($node);
    $data['ruang'] = $this->search3d-> resultRuang ();
    $data['menu_aktif']= 'ruang';
    $data['halaman']= "halaman/resultRuang";
    $this->load->view('template/search_view',$data);
}

This is View code:

<?php
echo form_open('mainSearch/resultRuang');
echo 'Ruang yang dipilih :';
echo $ruang -> node_id; //this is also error
echo '<a href= "'.base_url().'index.php/mainSearch/searchRuang"> <button name="name"     type="button">Back</button></a>';
echo form_close();
?>

For the first error, you can do this

$this->db->where('node_id', $node_id);

And for the second you need to var_dump($ruang); and see if $ruang->node_id even exists.

Also, showing what errors you get might help. Read the Stack Overflow FAQ before you post another question.

In your controller the:

    $this->search3d -> activatedNode($node); //incorrect

should be

    $this->search3d -> activatedNode($node_id);//correct

because in your model the function activatedNode($node_id) $node_id doesn't really exist in your function that's why it return false