php分页函数
2015-01-24信息快讯网
/*
需求，建立一个test数据库，在里边建一个test表，里面就
只要id字段，输入一下数据就可以啦。。
由于水平有限，难免出错。。
*/
$conn = mysql_connect("localhost","root","");
$maxnum = 2; //每页显示记录条数
mysql_select_db("test", $conn);
$query1 = "SELECT COUNT(*) AS totalrows FROM test ";
$result1 = mysql_query($query1, $conn) or die(mysql_error());
$row1 = mysql_fetch_assoc($result1);
$totalRows1 = $row1['totalrows']; //数据集数据总条数
$totalpages = ceil($totalRows1/$maxnum);//计算可分页总数，ceil()为上舍函数
if(!isset($_GET['page']) || !intval($_GET['page']) || $_GET['page'] > $totalpages) $page = 1; //对3种出错进行默认处理
//在url参数page不存在时，page不为10进制数时，page大于可分页数时，默认为1
else $page = $_GET['page'];
$startnum = ($page - 1)*$maxnum; //从数据集第$startnum条开始取，注意数据集是从0开始的
$query = "SELECT * FROM test LIMIT $startnum,$maxnum";//选择出符合要求的数据 从$startnum条数据开始，选出$maxnum行
$result = mysql_query($query, $conn) or die(mysql_error());
$row = mysql_fetch_assoc($result);
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>分页示例</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_jumpMenu(targ,selObj,restore){ //v3.0
eval(targ+".location='"+selObj.options[selObj.selectedIndex].value+"'");
if (restore) selObj.selectedIndex=0;
}
//-->
</script>
<style type="text/css">
a{text-decoration:none;}
a:hover{text-decoration:underline}
table{font-size:12px;}
.tb{background-color:#73BB95}
.tr{background-color:#FFFFFF}
</style>
</head>
<body>
<table width="30%" border="0" align="center" cellpadding="0" cellspacing="1" class="tb">
<tr>
<td height="24"><div align="left">分页示例</div></td>
</tr>
<?php if($totalRows1) {//记录集不为空显示
do {
?>
<tr class="tr">
<td height="24"><div align="center"><?php echo $row['id'];?></div></td>
</tr>
<?php }while($row = mysql_fetch_assoc($result));?>
</table>
<table width="95%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr><form name="form1">
<td height="27"><div align="center">
<?php
echo "共计<font color=\"#ff0000\">$totalRows1</font>条记录";
echo "<font color=\"#ff0000\">".$page."</font>"."/".$totalpages."页 ";
//实现 << < 1 2 3 4 5> >> 分页链接
$pre = $page - 1;//上一页
$next = $page + 1;//下一页
$maxpages = 4;//处理分页时 << < 1 2 3 4 > >>显示4页
$pagepre = 1;//如果当前页面是4，还要显示前$pagepre页，如<< < 3 /4/ 5 6 > >> 把第3页显示出来
if($page != 1) { echo "<a href='".$_SERVER['PHP_SELF']."'><<</a> ";
echo "<a href='".$_SERVER['PHP_SELF'].'?page='.$pre."'><</a> ";}
if($maxpages>=$totalpages) //如果总记录不足以显示4页
{$pgstart = 1;$pgend = $totalpages;}//就不所以的页面打印处理
elseif(($page-$pagepre-1+$maxpages)>$totalpages)//就好像总页数是6，当前是5，则要把之前的3 4 显示出来，而不仅仅是4
{$pgstart = $totalpages - $maxpages + 1;$pgend = $totalpages;}
else{
$pgstart=(($page<=$pagepre)?1:($page-$pagepre));//当前页面是1时，只会是1 2 3 4 > >>而不会是 0 1 2 3 > >>
$pgend=(($pgstart==1)?$maxpages:($pgstart+$maxpages-1));
}
for($pg=$pgstart;$pg<=$pgend;$pg++){ //跳转菜单
if($pg == $page) echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$pg\"><font color=\"#ff0000\">$pg</font></a> ";
else echo "<a href=\"".$_SERVER['PHP_SELF']."?page=$pg\">$pg</a> ";
}
if($page != $totalpages)
{echo "<a href='".$_SERVER['PHP_SELF'].'?page='.$next."'>></a> ";
echo "<a href='".$_SERVER['PHP_SELF'].'?page='.$totalpages."'>>></a> ";}
?>
<select name="menu1" onChange="MM_jumpMenu('parent',this,0)">
<option value="">选择</option>
<?php for($pg1=1;$pg1<=$totalpages;$pg1++) {
echo "<option value=\"".$_SERVER['PHP_SELF']."?page=$pg1\">".$pg1."</option>";
}?>
</select>
</td></form>
</tr>
</table>
<?php } else {//记录集为空时显示?>
<tr class="tr">
<td height="24"><div align="center">没有任何记录</div></td>
</tr>
</table>
<?php }?>
</body>
</html>
<?php
mysql_free_result($result1);
mysql_free_result($result);
?>