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>
<meta charset="UTF-8">
<title>登陆</title>
<style type="text/css">
*{
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>
<body bgcolor="#d0d0d0">
<div class="center-in-center">
<h2 align="center">用户登录</h2>
<form name="dl" action="dl.php" method="post">
<p align="center">用户名：<input type=text name="name"></p>
<p align="center">密码：<input type=password name="password"></p>
<p align="center"><input type="submit" name="denglu" value="登录"></p>
</form>
<form name="ze" action="zc.html" method="post" >
<p align='center'><input type="submit" name="zhuce" value="注册" > </p>
</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>
<title>注册</title>
<meta charset="utf-8">
<style type="text/css">
*{
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>
<body bgcolor="#d0d0d0">
<div class="center-in-center">
<h2 align="center">用户注册</h2>
<form action="zhuce.php" method="post">
<p align='center'>用户账户：<input id="user" name="user" type="text" placeholder="用户名"/></p>
<p align='center'>注册密码：<input id="psd1" name="psd1" type="password" placeholder="密码"/></p>
<p align='center'>重复密码：<input id="psd2" name="psd2" type="password" placeholder="验证密码"/></p>
<p align='center'>注册邮箱：<input id="eml" name="eml" type="email" placeholder="邮箱"/></p>
<p align='center'><input id="sbt" name="sbt" type="submit" placeholder="提交"/></p>
</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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
php留言板
</title>
<style>
p,textarea{vertical-align:top;}
</style>
</head>
<body bgcolor="#d0d0d0">
<h2 align="center">请留言</h2>
<form action="ly.php" method="post" align='center'>
<p align="center">姓名:<input type="text" name="username" /></p>
<p align="center">留言:<textarea cols="30" rows="5" name="comment" /></textarea></p>
<input type="submit" value="提交">
</form>
<form action="chakan.php" method="post" align='center'>
<input type="submit" name="chakan" value="查看留言" >
</form>
<form action="index.html" method="post" align='center'>
<input type="submit" name="zhuxiao" value="注销" >
</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>
<title>删除留言</title>
</head>
<body bgcolor="#d0d0d0">
<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($result))
{
echo "<tr>
<td>{$attr[1]}</td>
<td>{$attr[1]}</td>
<td><a onclick="return confirm('确定删除么')" href='delete.php?code={$attr[0]}'>删除</a></td>
</tr>";
}
echo "</table>";
echo '<p><form action="chakan.php" method="post" align="center">
<input type="submit" name="fh" value="点击返回">
</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;