Appserv : สอบถามเรื่องผลกระทบการเขียนโค้ดวน loop ครับ

<?
mysql_connect("localhost","root","1234") or die ("ติดต่อ Host ไม่ได้");
mysql_select_db("repair") or die ("ติดต่อฐานข้อมูลไม่ได้");
mysql_query("SET NAMES utf8");
?>
...
...
...
<?
$adate = date('Y-m-d');
$date2 = date("Y-m-d",strtotime("-2 days",strtotime($adate)));
echo $id;
$current_page = 1;
if(isset($_GET['page'])){
	$current_page = $_GET['page'];
}
$row_per_page = 15;

$start_row = ($current_page - 1) * $row_per_page;
	/*$sql = "select SQL_CALC_FOUND_ROWS * FROM repair_od 
	inner join equipment on eq_id = re_items
	inner join eq_problem on p_id = re_detail1
	WHERE status = 'active' ORDER BY re_id  DESC LIMIT $start_row, $row_per_page";*/
	$sql = "select SQL_CALC_FOUND_ROWS * FROM repair_od  inner join example.store on store.storecode = s_code INNER JOIN equipment ON eq_id = re_items WHERE repair_od.re_status = 'active' ORDER BY re_id  DESC LIMIT $start_row, $row_per_page";
	$result = mysql_query($sql) or die (mysql_error());

?>
<div class="container">
<h4>รายการแจ้งซ่อมทั้งหมด</h4>
<br />
<table  class="table table-striped">
<tr>
<th width="50"> <div align="center">#</div></th>
<th > <div align="center">รหัสแจ้งซ่อม</div></th>
<th > <div align="center">รหัสสาขา</div></th>
<th > <div align="center">สาขา</div></th>
<th > <div align="center">วันที่แจ้ง</div></th>
<th > <div align="center">อุปกรณ์ที่แจ้ง</div></th>
<th > <div align="center">จุดที่ชำรุด</div></th>
<th > <div align="center">อาการที่แจ้ง</div></th>
<th colspan="2"><div align="center">ตัวเลือก</div></th>
</tr>
<?
while ($objResult = mysql_fetch_array($result)){
	$url = $_SERVER['PHP_SELF'];
?>
<tr>
<td><div align="center"><?=$objResult["re_id"];?></div></td>
<td align="center"><?=$objResult["re_code"];?></td>
<td align="center"><?=$objResult["s_code"];?></td>
<td align="center"><?=$objResult["s_name"];?></td>
<td><div align="center"><?=$objResult["re_date"];?></div></td>
<td align="center"><?=$objResult["eq_name"];?></td>
<td align="center"><?=$objResult["re_item2"];?></td>
<td align="center"><?=$objResult["re_detail1"];?></td>
<td align="center" ><a href="report.php?id=<?php echo $objResult["re_id"]?>">แจ้งปิด</a></td>
<td align="center" ><a href="edit_repair.php?type=edit&&id=<?php echo $objResult["re_id"]?>">แก้ไข</a></td>

</tr>
<?
}
?>
</table>
<? 
$found_rows = mysql_query("select FOUND_ROWS()");
$total_rows = mysql_result($found_rows, 0, 0);
$total_pages = ceil($total_rows / $row_per_page);

$page_range = 5;
$page_start = $current_page - $page_range;
$page_end = $current_page + $page_range;
?>
<ul class="pagination">
<?
	echo "<li><a href=\"$url?page=1\">หน้าแรก</a></li>";
if($current_page > 1){
	$pg = $current_page - 1;
	echo "<li><a href=\"$url?page=$pg\">ย้อนกลับ</a></li>";
}
	//else  echo "<li><a href=\"$url?page=1\">หน้าแรก</a></li>";

if($current_page > 1){
	$pg = $current_page - 1;
	echo "<li><a href=\"$url?page=$pg\">...</a></li>";
}

if($page_start < 1){
	$page_end += 1 - $page_start; // เช่น 1-(-2) = 3 
	$page_start = 1;
}
if($page_end > $total_pages){
	$diff = $page_end - $total_pages;
	$page_start -= $diff;
	if($page_start < 1 ) {
		$page_start = 1;
	}
	$page_end = $total_pages;
}
for($i = $page_start; $i <= $page_end; $i++) { 
echo "&nbsp;";
if($i == $current_page){
	echo "<li class='active'><a href=\"#\">$i</a></li>";
}
else {
	echo "<li><a href=\"$url?page=$i\">$i</a></li>";
}
	echo "&nbsp;";
}
if($current_page < $total_pages){
	$pg = $current_page + 1;
	echo "<li><a href=\"$url?page=$pg\">...</a></li>";
}
if($current_page < $total_pages){
	$pg = $current_page + 1;
	echo "<li><a href=\"$url?page=$pg\">ถัดไป</a></li>";
}
?>