Mencari di CI pake Session (bukan DB)

<?php
if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/*
==========================================
UNTUK CONTROLERNYA
aplication/controler
rumah.php (ganti sesuai kebutuhan)
==========================================
*/
class rumah extends CI_Controller {
/*UNTUK NYARI AJA*/
        function cari()
        {
            $this->load->model('carimodel');
            if($_POST)
            {
                $id=$this->carimodel->cariId();
                redirect( current_url()); exit();
            }
            $ses=$this->session->all_userdata();
            $cari=$ses['cari'];
            //die ("$cari page=".intval($this->uri->segment(3)) );
            $d['cari']=$this->carimodel->resultCari();
            $d['page']=intval($this->uri->segment(3))+1;
            $this->load->view('cari_view',$d);
        }
}

/*
==========================================
UNTUK MODELNYA
aplication/model
carimodel.php
==========================================
*/
<?php


class carimodel extends CI_Model
{
    //mencari id mencari
    function cariId()
    {
        $a=array('cari'=>$_POST['cari']);
        $this->session->set_userdata($a);

    }

    function resultCari()
    {
        $num=30; //ubah bila kurang
        $page=intval($this->uri->segment(3))*$num;
        $a =array();
        /*
        //===========konsepnya.. masukkan di $sql====

        $sql="select * from my_table where
        cari like '%$cari%' limit $page,$num";
        $q=$this->db->query($sql);
        foreach ($q->result_array() as $row)
        {
            $a[]=$row;

        }
        */
        return $a;

    }
}

/*
==========================================
UNTUK VIEWNYA
aplication/views
cari_view.php
==========================================
*/
<!--
TEMPAT MENAMPILKAN
-->
<?php
$s='';
foreach($cari as $v)
{
    $s.="<p>$judul $link<br>$ket";
    //gambaran saja.. silakan diperbaiki
    //sesuai kebutuhan
}

echo $s;$s='';
?>
HALAMAN:<br>
<?php
$s.="<a href='".base_url()."rumah/cari'>Pertama</a> ";
for($i=1;$i< $page;$i++)
{

    $s.="<a href='/rumah/cari/$i'>$i</a> ";

}
$s.="$i ";
$s.="<a href='".base_url()."rumah/cari/$i'>Selanjutnya</a> ";
//lebih suka yang ini dibandingkan menampilkan semua hasil pencarian
echo $s;
?>