php|mysql|大数据量分页|BETWEEN AND , IN()

<?php
header('Content-type:text/html; charset=utf-8');
$link = mysql_connect('localhost', 'root', '36936999');
mysql_select_db('test', $link);
function fetch($sql, &$link){
	$query = mysql_query($sql, $link);
	return mysql_fetch_array($query);	
}
function fetchs($sql, &$link){
	$query = mysql_query($sql, $link);
	while($row = mysql_fetch_array($query, MYSQL_ASSOC)){
		$record[] = $row;	
	}
	return $record;
}
//==========================================================================================================//
$stime = microtime(true);
//==========================================================================================================//

$table = 'sign';
$pageSize = 80;
$pageOffset = 100;

$page = (int)$_GET['page'];
$page = $page ? $page -1 : 0;

$row = fetch("SELECT COUNT(id) AS total FROM {$table}", $link);
$total = $row['total'];
$count = ceil($total/$pageSize);

echo '当前是页数：'.($page+1).'<br />';
echo '当前表格的数据总量为：'.$total.'<br />';
echo '设定的每页的记录数（步长）为：'.$pageSize.'<br />';
echo '那么则会有分页数量：'.$count.'<br />';
echo '设定的分页步长为：'.$pageOffset.'<br />';

//===========================================================================================================//

$start = $page * $pageSize;

$end = $start + $pageSize -1;

$sql = "SELECT id,uid,time,num,letter FROM sign WHERE id BETWEEN $start AND $end";
echo $sql.'<br />';

$result = fetchs($sql, $link);
echo '<div style="width:600px; height:200px; margin-top:30px; word-break:break-all; word-wrap:break-word;">';
foreach($result as $val){
	echo '<span>'.$val['id'].',</span>';
}
echo '</div>';

$page ++;

echo '<div style="width:600px; height:200px; margin-top:30px; word-break:break-all; word-wrap:break-word;">';
if($page >= 1 && $page < $count){
	for($i=1; $i<$pageOffset; $i++){
		echo '<a style="margin:3px;" href="page.php?page='.($page+$i).'">'.($page+$i).'</a>';
	}	
}
echo '</div>';

//===========================================================================================================//
$etime = microtime(true);

echo $stime.'<br>';
echo $etime.'<br>';
echo '页面花费时间为：'.round($etime - $stime, 3);