// 검색 파라미터
class search_seg {
  private $seg;
	
  public function __construct($n=3) {
    $CI =& get_instance();
    $this->seg = array_map(array('search_seg','escape'), $CI->uri->uri_to_assoc($n));
  }

  private function escape($v) {
    return mysql_real_escape_string($v);
  }

  public function get_seg($seg_key) {
    if (isset($this->seg[$seg_key]))
      return $this->seg[$seg_key];

    return false;
  }
	
  public function get_qstr() {		
    if ($this->seg) {
      $CI =& get_instance();
      return '/'.$CI->uri->assoc_to_uri($this->seg);
    }
  }
}

// replace
function qstr_rep($qstr, $key, $val='') {
  $keys = explode(',', $key);
  foreach ($keys as $row)
    $srh[] = '(/'.$row.'/[a-z0-9_-]+)';

  $val = ($val) ? '/'.$key.'/'.$val : '';
  return preg_replace($srh, $val, $qstr);
}


// 사용법
// EX: http//.../board/temp/page/1/wid/44/stx/text
$seg  = new search_seg(3); // 오프셋 설정 : 3번째 부터
$page = $seg->get_seg('page');
$wid  = $seg->get_seg('wid');
$stx  = $seg->get_seg('sst');
...
$qstr = $seg->get_qstr(); // query_string : /page/1/wid/44/stx/text ...

// 값 변환
$qstr_test1 = qstr_rep($qstr, 'stx', 'val');
// > /page/1/wid/44/stx/val ...

// 값 삭제
$qstr_test2 = qstr_rep($qstr, 'page,stx');
// > /wid/44 ...