ช้วยดู code ให้หน่อยคครับ มันบอกว่าตัวแปรไม่ได้รับค่าเลย

function paging_start_row($current_page, $rows_per_page){
	return($current_page -1) * $rows_per_page;
	}
function paging_total_pages($total_rows, $row_per_page){
	return ceil($total_rows/$row_per_page);
	}
function paging_pagenum($current_page, $total_pages,$page_range,$quey_string){
    $page_start = $current_page - $page_range;
	$page_end = $current_page + $page_range;
	if($page_start<1){
		$page_end+=1-$page_start;
		$page_start=1;
		}
		if($page_end > $total_pages){
			$diff = $page_end - $total_pages;
			$page_start -= $diff;
			if($page_start<1)
			$page_start = 1;
			}
			$page_start = $total_pages;
			
			}
			
$url = $_SERVER['PHP_SELF']."?".$query_string;
			$result="";
			if($current_page>1){
				$pg = $current_page - 1;
				$result.="&nbsp;";
				$result.= "<a href=\"$url&page=$pg\">ย้อนกลับ</a>";
				}
			if($page_start>1){
				$pg = $page_start - 1 ;
				$result.="&nbsp;";
				$result.= "<a href=\"$url&page=$pg\">...</a>";
				}
				for($i = $page_start; $i<=$page_end; $i++){
					$result.="&nbsp;";
					if($i==$current_page){
						$result.=$i;
						}
						else{
							$result.="<a href=\"$url&page=$i\">$i</a>";
							}
							$result.="&nbsp;";
							
					}
					if($page_end<$total_pages){
						$pg=$page_end+1;
						$result.="&nbsp;";
						$result.="<a href=\"$url&page=$pg\">...</a>";
						}
					if($current_page<$total_pages){
						$pg=$current_page+1;
						$result.="&nbsp;";
						$result.="<a href=\"$url&page=$pg\">ถัดไป</a>";
						}	
						if($result==""){
							return"1";
							}
							else{
								return $result;
								}