PHP通用分页

php通用分页，先看下样式

代码如下：

<style>
body {
    font-size:12px;font-family:verdana;100%;
}
div.page{
    text-align:center;
}

div.content{
    height:300px;
}

div.page a{
    border:#aaaadd 1px solid;text-decoration:none;padding:2px 5px 2px 5px;margin:2px;
}

div.page span.current{
    border:#000099 1px solid;background-color:#000099;padding:4px 6px 4px 6px;margin:2px;color:#fff;font-weight:bold;
}

div.page span.disable{
    border:#eee 1px solid;padding:2px 5px 2px 5px;margin:2px;color:#ddd;
}

div.page form{
    display:inline;
}
</style>
<?php
header("Content-type:text/html;charset=utf-8");
//传入页码
$page = isset($_GET['p']) ? $_GET['p'] : 1;

$page = $page > 0 ? intval($page) : 1;

$conn = mysql_connect("127.0.0.1","root","") or die('连接数据库失败');
mysql_select_db("demo",$conn);
mysql_query("SET NAMES UTF8");

$pageSize = 10;//每页显示的数据
$showPage = 5;//显示页码
$sql = "select * from demo limit ".($page-1)*$pageSize.",".$pageSize;
$result = mysql_query($sql,$conn);

echo '<div class="content"><table border=1 cellspacing=0 width=40% align="center">';
echo '<tr><td>ID</td><td>NAME</td></tr>';
while($row = mysql_fetch_assoc($result)){
    echo '<tr>';
    echo '<td>'.$row['id'].'</td>';
    echo '<td>'.$row['name'].'</td>';
    echo '</tr>';
}
echo '</table></div>';
mysql_free_result($result);
$total_sql = "select count(*) from demo";
$total_result = mysql_fetch_array(mysql_query($total_sql));
$total = $total_result[0];

//计算总页数
$total_page = ceil($total/$pageSize);
mysql_close($conn);
/*分页条*/
$page_banner = '<div class="page">';

//偏移量
$pageOffset = ($showPage-1)/2;

if ($page > 1) {
    $page_banner .= '<a href="'.$_SERVER['PHP_SELF'].'?p=1">首页</a>&nbsp;';
    $page_banner .= '<a href="'.$_SERVER['PHP_SELF'].'?p='.($page-1).'"><<上一页</a>&nbsp;';
} else {
    $page_banner .= '<span class="disable">首页</span>';
    $page_banner .= '<span class="disable"><<上一页</span>';
}

//page start

//初始化数据
$start = 1;
$end = $total_page;

if ($total_page > $showPage){
    if ($page > $pageOffset+1) {
        $page_banner.= '...';
    }

    if ($page > $pageOffset) {

        //开始位置总是当前页-偏移量
        $start = $page - $pageOffset;

        //右边的显示码加偏移量小于总页数就显示当前页+偏移量否则就显示最后页
        $end = $total_page > ($page + $pageOffset) ? ($page + $pageOffset) : $total_page;
    } else {
        $start = 1;
        $end = $total_page > $showPage ? $showPage : $total_page;
    }

    if ($page+$pageOffset > $total_page) {

        //实际的开始位置-(当前位置+偏移量-最后一页)
        $start = $start - ($page + $pageOffset - $end);
    }
}

for($i = $start; $i <= $end; $i++ ){

    if ($page == $i) {
        $page_banner .= '<span class="current">'.$i.'</span>';
    } else {
        $page_banner .= '<a href="'.$_SERVER['PHP_SELF'].'?p='.($i).'">'.$i.'</a>';
    }
}


if ($total_page > $showPage && $total_page > $page + $pageOffset) {
    $page_banner.= '...';
}

//page end
if ($page < $total_page) {
    $page_banner .= '<a href="'.$_SERVER['PHP_SELF'].'?p='.($page+1).'">下一页>></a>';
    $page_banner .= '<a href="'.$_SERVER['PHP_SELF'].'?p='.($total_page).'">尾页</a>';
} else {
    $page_banner .= '<span class="disable">下一页>></span>';
    $page_banner .= '<span class="disable">尾页</span>';
}
$page_banner .= '共'.$total_page.'页';
$page_banner .= '到第<form action="mypage.php" method="get">';
$page_banner .= '<input type="text" size="2" name="p"/>页';
$page_banner .= '<input type="submit" value="确定"/>';
$page_banner .= '</form></div>';
echo $page_banner;