新手简单的PHP分页问题，但是不知道为什么不分页？
<?function pager($rows,$page_size){ global $page,$select_from,$select_limit,$pagenav; $page_count = ceil($rows/$page_size); if($page <= 1 || $page == '') $page = 1; if($page >= $page_count) $page = $page_count; $select_limit = $page_size; $select_from = ($page - 1) * $page_size.','; $pre_page = ($page == 1)? 1 : $page - 1; $next_page= ($page == $page_count)? $page_count : $page + 1 ; $pagenav .= "第 $page/$page_count 页 共 $rows 条记录 "; $pagenav .= "<a href='?page=1'>首页</a> "; $pagenav .= "<a href='?page=$pre_page'>前一页</a> "; $pagenav .= "<a href='?page=$next_page'>后一页</a> "; $pagenav .= "<a href='?page=$page_count'>末页</a>"; $pagenav.=" 跳到<select name='topage' size='1' onchange='window.location=\"?page=\"+this.value'>\n"; for($i=1;$i<=$page_count;$i++){ if($i==$page) $pagenav.="<option value='$i' selected>$i</option>\n"; else $pagenav.="<option value='$i'>$i</option>\n"; } } include("conn.php");///////////////////////////// 利用pager函数计算出 $select_from 从哪条记录开始检索、$pagenav 输出分页导航 $rows = mysql_num_rows(mysql_query("select * from manager")); echo $rows;pager($rows,2); $sql = "select * from manager limit $select_from $select_limit"; echo $sql;$rst = mysql_query($sql); while($row=mysql_fetch_array($rst)){?> <tr bgcolor="#FFFFFF" onMouseOver="javascript:this.bgColor='#D9FA9C'" onMouseOut="javascript:this.bgColor='#FFFFFF'" style="CurSoR:hand;"> <td align="center" ><input type="checkbox" name="SelectItem" value=""></td> <td align="left" ><?=$row[chinaname]?></td> <td align="left" ><?=$row[username]?></td> <td align="left"><?=$row[Purview]?></td> <td align="left"><?=$row[password]?></td> <td align="center" ><?=$row[Tel]?></td> <td align="center"><?=$row[FAX]?></td> <td align="center"><?=$row[Mobile]?></td> <td align="center" ><? if ($row[sfxs]==0){ echo "显示"; }else{ echo "隐藏"; } ?></td> <td align="center" ><? if ($row[sfjy]==0){ echo "禁用"; }else{ echo "启用"; } ?></td> <td ><?=$row[Adddate]?></td> </tr> <? } echo $pagenav; ?>