mencari di CI

<?php
/*
biar ada warnanya
*/

//controler
function cari()
{
    $this->load->model('homemodel');
    $d['cari']=$this->homemodel->cari();
    $this->load->view('basic_view',$d);
}


//model
function cari()
{
    $cari=$_POST['cari'];
    $sql="select * from artikel where
    (judul like '%$cari%') or
    (isi like '%$cari%') or
    (headline like '%$cari%')
    limit 50";
    $q=$this->db->query($sql);
        foreach ($q->result_array() as $row)
        {
            $a[]=$row;
        }

    return $a;
}

//view
<?php
$s="<li>";
foreach($cari as $v)
{


}
$s.="</li>";
echo $s;