codeigniter get分页教程

 public function project_search(){
        $this->load->library('pagination');
        $this->load->model('depart_mdl');
        //获取搜索需要的信息
        $data = $this->get_project_data();
        $get_data = $this->input->get();
        $data = array_merge($data,$get_data);
        //get分页配置
        $name = $get_data['name'];
        $username = $get_data['username'];
        $budget = $get_data['budget'];
        $type = $get_data['type'];
        $posttime_start = $get_data['posttime_start'];
        $posttime_end = $get_data['posttime_end'];
        $purchase_type = $get_data['purchase_type'];
        $depart_code = $get_data['depart_code'];
        $project_status = $get_data['project_status'];
        $bidder_way = $get_data['bidder_way'];
        $suffix = "?name=$name&username=$username&budget=$budget&type=$type&posttime_start=$posttime_start&posttime_end=$posttime_end&purchase_type=$purchase_type&depart_code=$depart_code&project_status=$project_status&bidder_way=$bidder_way";
        $config['base_url'] = site_url('project/project_search').$suffix;
        $config['total_rows'] = $this->db->count_all($this->db->dbprefix('project'));
        $config['per_page'] = 10;
        $config['page_query_string'] = TRUE;
        //偏移量
        $config['query_string_segment'] = 'page';
        $config['uri_segment'] = 3;
        $this->pagination->initialize($config);
        $user = $this->user_mdl->get_user_by_salary_no($this->session->userdata('salary_no'));
        $this->db->from('ustc_project');
        $this->db->join('ustc_admins','ustc_admins.salary_no=ustc_project.salary_no');
        if($user->role!=1){
            $depart_code = explode(',',$user->grant_depart_code);
            $this->db->where_in('grant_depart_code',$depart_code);
            $this->db->or_where('ustc_project.salary_no =',$this->session->userdata('salary_no'));
        }
        if($name != ''){
            $this->db->like('name',$name);
        }
        if($username != ''){
            $this->db->like('username',$get_data['username']);
        }
        if($budget != ''){
            $this->db->like('budget',$get_data['budget']);
        }
        if($type != ''){
            $this->db->where('type',$get_data['type']);
        }
        if($depart_code != ''){
            $this->db->where('depart_code',$get_data['depart_code']);
        }
        if($purchase_type != ''){
            $this->db->where('purchase_type',$get_data['purchase_type']);
        }
        if($project_status != ''){
            $this->db->where('project_status',$get_data['project_status']);
        }
        if($bidder_way != ''){
            $this->db->where('bidder_way',$get_data['bidder_way']);
        }
        //时间
        if($posttime_start != ''){
            $this->db->where('posttime > ',strtotime($get_data['posttime_start']));
        }
        if($posttime_end != ''){
            $this->db->where('posttime < ',strtotime($get_data['posttime_end']));
        }
        if(isset($get_data['page'])){
            $page_from = $get_data['page'];
        }else{
            $page_from = 0;
        }
        $this->db->order_by('posttime','desc');
        $projects = $this->db->limit($config['per_page'],$page_from)->get()->result_array();    
        
        //处理
        for($i=0;$i<count($projects);$i++){
            $projects[$i]['type'] = $this->manage_info_mdl->get_value_by_id($projects[$i]['type'])->value;
            $projects[$i]['purchase_type'] = $this->manage_info_mdl->get_value_by_id($projects[$i]['purchase_type'])->value;
            $projects[$i]['depart'] = $this->depart_mdl->get_depart_by_code($projects[$i]['depart_code'])->name;
        }
        $data['projects'] = $projects;
        //获取当前用户的角色
        $data['user_role'] = $this->user_mdl->get_user_by_salary_no($this->session->userdata('salary_no'))->role;    
        $this->_template('project_search',$data);
    }