Codeigniter pagination error after searching - php

Question

After searching data when i click on next page then it doesn't work with searching results. After click it goes on first page. How can i solve this problem ?
Thank you
Controller:
public function gkclientsadd(){
$arg["src"] = 0;
$arg["pageOffset"] = 0;
$np = $this->uri->segment(3);
$data["offset"] = 0;
$this->search_by = 0;
if($_SERVER['REQUEST_METHOD'] == 'GET')
{
if(isset($_GET["client_search"]))
{
$arg["login"] = $this->input->get('login');
$arg["pwd"] = $this->input->get('pwd');
$arg["basetariff"] = $this->input->get("basetariff");
$arg["crc"] = $this->input->get("crc");
$arg["resone"] = $this->input->get("resone");
$arg["rpp"] = $this->default_rpp;
$arg["offset"] = $this->default_offset;
$arg["src"] = 1;
$this->search_basetariff = $arg["basetariff"];
$this->search_currency = $arg["crc"];
$this->search_parent = $arg["resone"];
$this->search_by = 1;
//print_r($arg);die;
} else $arg["src"] = 0;
}
if(!empty($np)){
$arg["pageOffset"] = ($np/$this->default_rpp);
$arg["rpp"] = $this->default_rpp;
$arg["offset"] = ($this->default_rpp)*$arg["pageOffset"];
$data["offset"] = $arg["offset"];
$arg["src"] = 1;
}
$data["gkclientsData"] = $this->admin_model->getGkclients($this->userId, $this->rtc_table,$arg, $this->default_rpp, $this->default_offset);
$data["getTotalGk"] = $this->admin_model->getTotalGk($this->rtc_table,$arg);
$data["totalRecords"] = count($data["getTotalGk"]);
$data["totalPage"] = $data["totalRecords"]/$this->default_rpp;
$data["Page"] = $arg["pageOffset"]+1;
$config = array();
$config["base_url"] = base_url() . "index.php/admin/gkclientsadd";
$config["total_rows"] = $data["totalRecords"] ;
$config["per_page"] = $this->default_rpp;
$config["uri_segment"] = 3;
$config['first_url'] = $config['base_url'].'?'.http_build_query($_GET);
$this->pagination->initialize($config);
$page = ($this->uri->segment(3)) ? $this->uri->segment(3) : 0;
$data["links"] = $this->pagination->create_links();
$this->load->view('admin/clients/gkclientsadd',$data);
}
Model:
public function getGkclients($userId, $rtc_table,$arg, $default_rpp,$default_offset)
{
$this->load->database();
if($arg['src']== 1){
$whr = "";
$rpp = "";
$offset = "";
if(!empty($arg["rpp"])) $rpp .= " LIMIT ".$arg["rpp"]."";
if(!empty($arg["offset"])) $offset .= " OFFSET ".$arg["offset"]."";
if(!empty($arg["login"])) $whr .= " AND $rtc_table.login = '".$arg["login"]."'";
if(!empty($arg["pwd"])) $whr .= " AND $rtc_table.password = '".$arg["pwd"]."'";
if(!empty($arg["basetariff"])) $whr .= " AND $rtc_table.id_tariff = '".$arg["basetariff"]."'";
if(!empty($arg["crc"])) $whr .= " AND $rtc_table.id_currency = '".$arg["crc"]."'";
if(!empty($arg["resone"])) $whr .= " AND $rtc_table.id_res = '".$arg["resone"]."'";
} else {
$whr="";
$rpp= "Limit $default_rpp";
$offset= "OFFSET $default_offset";
}
$query = "SELECT DISTINCT $rtc_table.id_client,$rtc_table.id_res,$rtc_table.login,$rtc_table.password,$rtc_table.id_tariff,
$rtc_table.account_state,$rtc_table.type,$rtc_table.type2,currency_names.name
FROM $rtc_table, currency_names
WHERE currency_names.id = $rtc_table.id_currency $whr
order by $rtc_table.login ASC $rpp $offset";
$query_result = $this->db->query($query);
$gkData=$query_result->result();
return $gkData;
}
http://i.stack.imgur.com/yMa6d.jpg