php分页代码简单实现

数据库操作类代码:mysqli.func.php

<?php
// 数据库连接常量
define('DB_HOST', 'localhost');
define('DB_USER', 'root');
define('DB_PWD', '');
define('DB_NAME', 'guest');

// 连接数据库
function conn()
{
    $conn = mysqli_connect(DB_HOST, DB_USER, DB_PWD, DB_NAME);
    mysqli_query($conn, "set names utf8");
    return $conn;
}

//获得结果集
function doresult($sql){
   $result=mysqli_query(conn(), $sql);
   return  $result;
}

//结果集转为对象集合
function dolists($result){
    return mysqli_fetch_array($result, MYSQL_ASSOC);
}

function totalnums($sql) {
    $result=mysqli_query(conn(), $sql);
    return $result->num_rows;
}




// 关闭数据库
function closedb()
{
    if (! mysqli_close()) {
        exit('关闭异常');
    }
}

?>

<?php
include 'mysqli.func.php';

// 总记录数
$sql = "SELECT dg_id  FROM  tb_user ";
$totalnums = totalnums($sql);

// 每页显示条数
$fnum = 8;

// 翻页数
$pagenum = ceil($totalnums / $fnum);

// 页数常量
@$tmp = $_GET['page'];

//防止恶意翻页
if ($tmp > $pagenum)
    echo "<script>window.location.href='index.php'</script>";

//计算分页起始值
if ($tmp == "") {
    $num = 0;
} else {
    $num = ($tmp - 1) * $fnum;
}

// 查询语句
$sql = "SELECT dg_id,dg_username  FROM  tb_user ORDER BY dg_id DESC LIMIT " . $num . ",$fnum";
$result = doresult($sql);

// 遍历输出
while (! ! $rows = dolists($result)) {
    echo $rows['dg_id'] . " " . $rows['dg_username'] . "<br>";
}

// 翻页链接
for ($i = 0; $i < $pagenum; $i ++) {
    echo "<a href=index.php?page=" . ($i + 1) . ">" . ($i + 1) . "</a>";
}
?>