2019-10-12,html+php+mysql简单留言板，作业

php+mysql简易留言板，实现注册，登录，注销，查看留言，删除留言

1，index.html登录页面

代码：

<!doctype html>

<html>

<head>

margin: 0;

padding: 0;

}

div{

200px;

height: 200px;

}

.center-in-center{

position: absolute;

top: 50%;

left: 50%;

-webkit-transform: translate(-50%, -50%);

-moz-transform: translate(-50%, -50%);

-ms-transform: translate(-50%, -50%);

-o-transform: translate(-50%, -50%);

transform: translate(-50%, -50%);

}

</style>

</head>

</form>

</form> </div>

</body>

</html>

css样式用来将页面标签居中对齐

2,建立数据库连接文件conn.php

<?php

$server="localhost:3306";//主机的IP地址，你也可以选填127.0.0.1

$db_username="root";//数据库用户名

$db_password="root";//数据库密码

$con = mysqli_connect($server,$db_username,$db_password);//链接数据库

if(!$con){

die("can't connect".mysql_error());//如果链接失败输出错误

}

mysqli_select_db($con,'zhuce');//选择数据库

3，登录后端验证dl.php

<?php

header("Content-Type: text/html; charset=utf8");

if(!isset($_POST["denglu"])){

echo "错误执行";

echo "<script> setTimeout(function(){window.location.href='index.html';},2000); </script>";}//检测是否有submit操作

include('conn.php');//链接数据库

$name = $_POST['name'];//post获得用户名表单值

$passowrd = $_POST['password'];//post获得用户密码单值

if ($name && $passowrd){//如果用户名和密码都不为空

$sql = "select * from t1 where username = '$name' and password='$passowrd'";//检测数据库是否有对应的username和password的sql

$result = mysqli_query($con,$sql);//执行sql

$rows=mysqli_num_rows($result);//返回一个数值

if($rows){//0 false 1 true

echo $rows;

header("refresh:0;url=ly.html");//如果成功跳转至welcome.html页面

exit;

}

else{

echo "<script>alert('用户名或密码错误,点击确定返回！');</script>";

header("refresh:0;url=index.html");

}

}else{//如果用户名或密码有空

echo "<script>alert('用户名或不能为空,点击确定返回！');</script>";

header("refresh:0;url=index.html");

}

mysqli_close($con);//关闭数据库

4,注册前端zc.html，

代码：

<!DOCTYPE html>

<html>

<head>

margin: 0;

padding: 0;

}

div{

200px;

height: 200px;

}

.center-in-center{

position: absolute;

top: 50%;

left: 50%;

-webkit-transform: translate(-50%, -50%);

-moz-transform: translate(-50%, -50%);

-ms-transform: translate(-50%, -50%);

-o-transform: translate(-50%, -50%);

transform: translate(-50%, -50%);

}

</style>

</head>

</form>

</div>

</body>

</html>

5，注册后端验证zhuce.php

代码：

<?php

header("content-type:text/html;charset=utf-8");

session_start();

$name=$_POST['user'];

$pwd=$_POST['psd1'];

$repwd=$_POST['psd2'];

$email=$_POST['eml'];

if(empty($name)||empty($pwd)||empty($repwd)||empty($email)){

echo "<script>alert('你逗我？信息输入没完整');</script>";

echo "<script>window.location='zc.html';</script>";

}else

if ($pwd!=$repwd) {

echo"<script>alert('两次密码输入不一致，请重新输入');</script>";

echo"<script>location='zc.html'</script>";

}else{

include('conn.php');

$sql1 = "SELECT * FROM t1 WHERE username='$name'";

$result = mysqli_query($con,$sql1);

$rows = mysqli_num_rows($result);

if($rows>0) {

echo "<script>alert('用户名已经有人注册了，重新注册一个吧')</script>";

echo "<script>window.location='zc.html'</script>";

}

else {

echo "用户名可用 ".'<br>';

mysqli_query($con,"set names utf8");

$sqlinsert="insert into t1(username,password,email) values('{$name}','{$pwd}','{$email}')";

$result=mysqli_query($con,$sqlinsert);

if(! $result )

{

die('Could not enter data: ' . mysqli_error());

}

echo "恭喜你注册成功".'<br>';

echo '用户名：'.$name.'<br>';

echo '密码：'.md5($pwd).'<br>';

echo '注册邮箱：'.$email.'<br>';

echo "正在返回登录界面，请稍后~";

header("refresh:2;url=index.html");

}

mysqli_close($con);

6，登录之后留言界面，前端，ly.html

代码：

<html>

<head>

<title>

php留言板

</title>

<style>

p,textarea{vertical-align:top;}

</style>

</head>

</form>

</form>

</form>

</body>

</html>

7，留言页面后端验证，ly.php

代码：

<?php

header("Content-Type: text/html; charset=utf8");

$user = $_POST['username'];

$comment = $_POST['comment'];

print_r($_POST);

if(empty($user)||empty($comment)){

echo "<script>alert('姓名或内容没输入，请输入好后提交！');</script>";

echo "<script>window.location='ly.html';</script>";

}

else{

include('conn.php');

$sql="insert into t2(username,comment) values('$user','$comment')";

$db=mysqli_select_db($con,'zhuce');

if($db){

$result = mysqli_query($con,$sql);

echo "<script>alert('留言成功');</script>";

header("refresh:0;url=ly.html");

}

else{

echo "留言失败！";

echo mysqli_errno($con);

}

mysqli_close($con);

8，查看留言，chakan.php

代码：

<?php

echo "<body bgcolor='#d0d0d0'>";

include('conn.php');

$sql="select * from t2";

$db=mysqli_select_db($con,'zhuce');

$result = mysqli_query($con,$sql);

$array=array();

echo "<h2 align='center'>所有留言</h2>";

echo '<table border="1" align="center"><td>用户</td><td>给你的留言</td>';

while($row = mysqli_fetch_array($result, MYSQLI_ASSOC))

{

echo "<tr><td> {$row['username']}</td> ".

"<td>{$row['comment']} </td> ".

"</tr>";

}

echo '</table>';

mysqli_close($con);

echo '<p><form action="ly.html" method="post" accept-charset="utf-8" align="center"><td><input type="submit" name="fanhui" value="点击返回"></form></p>';

echo '<p><form action="del.php" method="post" accept-charset="utf-8" align="center"><input type="submit" name="shanchu" value="删除留言"></form></p>';

echo "</body>";

9，删除留言，del.php

<html>

<head>

</head>

<h2 align="center">请找到要删除的留言，点击“删除”</h2>

<?php

include('conn.php');

$sql = "select * from t2";

mysqli_select_db($con,'zhuce');

$result = mysqli_query($con,$sql);

echo '<table border="1" align="center"><tr><td>用户</td><td>给你留言</td></tr>';

while($attr = mysqli_fetch_array($result))

{

echo "<tr>

</tr>";

}

echo "</table>";

echo '<p><form action="chakan.php" method="post" align="center">

</form></p>';

</body>

</html>

10,确定删除,delete.php

<?php

include('conn.php');

$code = $_GET["code"];

$sql = "delete from t2 where id = '{$code}'";

mysqli_select_db( $con, 'zhuce' );

$retval = mysqli_query( $con, $sql );

if(! $retval )

{

die('数据删除失败: ' . mysqli_error($con));

}

echo "数据删除成功，马上返回！";

mysqli_close($con);

header("refresh:1;url=del.php");

11,数据库文件，zhuce.sql

Navicat Premium Data Transfer

Source Server : localhost_3306

Source Server Type : MySQL

Source Server Version : 50726

Source Host : localhost:3306

Source Schema : zhuce

Target Server Type : MySQL

Target Server Version : 50726

File Encoding : 65001

Date: 12/10/2019 18:51:57

SET NAMES utf8mb4;

SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------

-- Table structure for t1

-- ----------------------------

DROP TABLE IF EXISTS `t1`;

CREATE TABLE `t1` (

`username` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,

`password` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,

`email` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL

) ENGINE = MyISAM CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------

-- Records of t1

-- ----------------------------

INSERT INTO `t1` VALUES ('1111', '111', '1111@qq.com');

INSERT INTO `t1` VALUES ('11111', '111', '1111@qq.com');

INSERT INTO `t1` VALUES ('sym', 'zzz', 'zzz@qq.com');

INSERT INTO `t1` VALUES ('111', '111', '1111@qq.com');

INSERT INTO `t1` VALUES ('222', '222', '222@a.com');

INSERT INTO `t1` VALUES ('asd', 'asd', 'asd@123.com');

INSERT INTO `t1` VALUES ('sym945', 'zxc', 'zxc@qq.com');

INSERT INTO `t1` VALUES ('555555', '555', '555@qq.com');

INSERT INTO `t1` VALUES ('syms', 'sss', 'sss@qq.com');

INSERT INTO `t1` VALUES ('zxzx', 'zxzx', 'zx@qq.co');

-- ----------------------------

-- Table structure for t2

-- ----------------------------

DROP TABLE IF EXISTS `t2`;

CREATE TABLE `t2` (

`id` bigint(20) NOT NULL AUTO_INCREMENT,

`username` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,

`comment` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,

PRIMARY KEY (`id`) USING BTREE

) ENGINE = MyISAM AUTO_INCREMENT = 21 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------

-- Records of t2

-- ----------------------------

INSERT INTO `t2` VALUES (19, '123', '123123');

INSERT INTO `t2` VALUES (20, '22333', '22333');

SET FOREIGN_KEY_CHECKS = 1;