php - Undefined variable id in CodeIgniter -

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i have todo list project.

my model

class model_lists extends ci_model {  function model_list(){     parent::__construct(); }  function list_get($id){     $this->load->database();     $query = $this->db->get_where('lists', array('id'=>$id));     return $query->row_array(); }

my controller

public function view_list($id){     $this->load->model('model_lists');     $data["query"] = $this->model_lists->list_get($id);     $this->load->view('lists/view_list',$data); }

list view

<?php  echo $query['list_by']; ?>

however, when access view 2 php errors

1) message: missing argument 1 lists::view_list()
2) message: undefined variable: id

this how call list:

<a class="view_list" href="<?php echo site_url("lists/view_list?lid={$row->list_id}");?>"><i class="icon-eye"> </i></a>

your site url not correct. error because no id being passed , in ci (unless have set use query arrays) url of format www.example.com/controller/method/argument

so try:

href="<?php echo site_url('lists/view_list/'.$row->list_id); ?>"

in docs: http://www.codeigniter.com/user_guide/helpers/url_helper.html#site_url


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