PHP分页

<?php$conn=mysql_connect("localhost","root","");//$result2=mysql_db_query("hello_world", "insert into hello_table values ('add1',8)",$conn);// $result2=mysql_db_query("hello_world", "delete from hello_table where hello_column='add1'",$conn);$resultNum=mysql_db_query("hello_world","select count(*) from hello_table order by hello_column" ,$conn);$RSS=mysql_fetch_array($resultNum);$num=$RSS[0];if(empty($_GET['page'])){$page=0;}else{$page=$_GET['page'];if($page<0){$page=0;}if($page>=ceil($num/5)){$page=ceil($num/5)-1;} }$excute="select * from hello_table order by hello_column limit ".($page*5).",5 ";$result=mysql_db_query("hello_world",$excute ,$conn);$row=mysql_fetch_row($result);for($i=0;$i<mysql_num_fields($result);$i++){echo mysql_field_name($result, $i)." ";}echo "<br>";while($row=mysql_fetch_row($result)){for($i=0;$i<mysql_num_fields($result);$i++){echo $row[$i]." ";}echo "<br>";}mysql_free_result($result);mysql_close($conn);
?>
<a href="test.php?page=0">FirstPage</a>
<a href="test.php?page=<?=($page-1) ?>">PrevPage</a>
<a href="test.php?page=<?=($page+1) ?>">NextPage</a>
<a href="test.php?page=<?=ceil($num/5)-1 ?>">LastPage</a>
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怎么分段，当前在第几段 （每页有几条，当前再第几页） 前10条记录：select * from table limit 0,10 第11至20条记录：select * from table limit 10,10 第21至30条记录：select * from table limit 20,10

（当前页数 - 1 ）X 每页条数 ， 每页条数Select * from table limit ($Page- 1) * $PageSize, $PageSize