PHP+MySQL makes a simple user registration and login interface (annotation is super detailed~with source code)

Language 2023-04-08 14:34:18 views: null

achievement

The website can judge whether the account information is legal, and at the same time, it comes with a verification code to verify the login. After the user enters the correct user name and password, there will be a pop-up window showing successful login. If the entered account does not exist, it will jump to the registration page.

 

 Implementation process

Project file assignment:

1. First create login.html

What is realized is the user login interface, which can beautify the page by customizing css. The main purpose here is to realize the function rather than the beautiful interface.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户登录</title>
<link href=../css/login.css rel="stylesheet"/>
</head>

<body background="./images/loginbg.png" style="background-size: 100% 100%;background-attachment: fixed;">
<div class=box>
	<div class=title>用户登录</div>
	<form action="../login.php" method="post">
		<table class=login>
			<tr><th>用户名：</th><td><input type="text" name="username"/></td></tr>
			<tr><th>密码：</th><td><input type="password" name="password"/></td></tr>
			<tr><th>验证码：</th><td><input type="text" name="captcha"/></td></tr>
			<tr><th></th><td><img src="../code.php"/></td></tr>
			<tr><th></th><td><input type="submit" value="登录"/><a href="register.php"><input type="button" value='前往注册'></a></td>
						
			</tr>
			
		</table>
	
	</form>
</div>
</body>
</html>

2. Create login.php and associate it with login.html

<?php
header('content-type:text/html;charset=utf-8');
//登录界面
require 'login_db_connect.php';//连接数据库


//判断表单是否提交,用户名密码是否提交
if (isset($_POST['username'])&&isset($_POST['password'])){//登录表单已提交
    
    //获取用户输入的验证码
    $captcha = isset($_POST['captcha']) ? trim($_POST['captcha']) : '';
    //获取Session中的验证码
    session_start();
    if(empty($_SESSION['captcha'])){  //如果Session中不存在验证码，则退出
        exit('验证码已经过期，请返回并刷新页面重试。');
    }
    //获取验证码并清除Session中的验证码
    $true_captcha = $_SESSION['captcha'];
    unset($_SESSION['captcha']); //限制验证码只能验证一次，防止重复利用
    //忽略字符串的大小写，进行比较
    if(strtolower($captcha) !== strtolower($true_captcha)){
        exit('您输入的验证码不正确！请返回并刷新页面重试。');
    }
    //验证码验证通过，继续判断用户名和密码
    //获取用户输入的用户名密码
    $username=$_POST["username"];
    $pwd=$_POST["password"];
    $sql="select id,username,password from user where username='$username' and password='$pwd';";
    $result=mysqli_query($con, $sql);//执行sql语句
    $row=mysqli_num_rows($result);//返回值条目
    if (!$row){//若返回条目不存在则证明该账号不存在或者密码输入错误
        echo "<script>alert('账号不存在或密码错误，点击前往注册');location='./register.php'</script>";
        //exit('账号或密码错误');
    }else{//存在返回条目证明用户账号密码匹配，进入主页面
        session_start();
        $_SESSION['username']=$_POST['username'];
        echo "<script>alert('欢迎');location='./index.php'</script>";
    }   
}


require './view/login.html';

3. Registration page register.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户注册</title>
<link href=../css/login.css rel="stylesheet"/>
</head>

<body background="./images/loginbg.png" style="background-size: 100% 100%;background-attachment: fixed;">
<div class=box>
	<div class=title>用户注册</div>
	<form action="../register.php" method="post">
		<table class=login>
			<tr><th>用户名：</th><td><input type="text" name="username"/></td></tr>
			<tr><th>密码：</th><td><input type="password" name="pwd"/></td></tr>
			<tr><th></th><td><input type="submit" value="注册"/></td>
			</tr>
			
		</table>
	
	</form>
</div>
</body>
</html>

4. Create register.php, associated with register.html.

<?php
header('content-type:text/html;charset=utf-8');
//注册页面
require 'login_db_connect.php';//连接数据库

//判断表单是否提交,用户名密码是否提交
if (isset($_POST['username'])&&isset($_POST['pwd'])){//登录表单已提交
    //获取用户输入的用户名密码
    $user=$_POST["username"];
    $pwd=$_POST["pwd"];
    //判断提交账号密码是否为空
    if ($user=='' || $pwd==''){
        exit('账号或密码不能为空');
    }else {
        $sql="insert into user(username,password) values ('$user','$pwd');";//添加账户sql语句
        $select="select username from user where username='$user'";
        $result=mysqli_query($con, $select);//执行sql语句
        $row=mysqli_num_rows($result);//返回记录数
        if(!$row){//记录数不存在则说明该账户没有被注册过
            if (mysqli_query($con,$sql)){//查询insert语句是否成功执行，成功将返回 TRUE。如果失败，则返回 FALSE。
                //跳转登录页面
                echo "<script>alert('注册成功，请登录');location='./login.php'</script>";
            }else{//失败则重新跳转注册页面
                echo "<script>alert('注册失败，请重新注册');location='./regsiter.php'</script>";
            }
        }else{//存在记录数则说明注册的用户已存在
            echo "<script>alert('该用户已经存在，请直接登录');location='./login.php'</script>";
        }
    }  
}


require './view/register.html';

5. Create code.php for generating verification codes

<?php
//用于生成验证码
//创建验证码画布
$img_w = 100;  //验证码的宽度
$img_h = 30;   //验证码的高度
$img = imagecreatetruecolor($img_w, $img_h);         //创建画布
$bg_color = imagecolorallocate($img,0xcc,0xcc,0xcc); //画布颜色
imagefill($img,0,0,$bg_color);                       //背景色

//生成验证码文本
$count = 4; //验证码位数
$charset = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'; //随机因子
$charset_len = strlen($charset)-1; //计算随机因子长度（作为取出时的索引）
$code = ''; //保存生成的验证码
for($i=0; $i<$count; ++$i) {
//通过索引取出字符，mt_rand()用于获取指定范围内的随机数
    $code .= $charset[mt_rand(0,$charset_len)];
}

//将生成的文本保存到Session中
session_start();//启动session
$_SESSION['captcha'] = $code;

//在画布中绘制验证码文本
$fontSize = 16;    //文字大小
$fontStyle = './fonts/SourceCodePro-Bold.ttf'; //字体样式
//生成指定长度的验证码
for($i=0; $i<$count; ++$i){
    //随机生成字体颜色
    $fontColor = imagecolorallocate($img,mt_rand(0,100),mt_rand(0,50),mt_rand(0,255));
    imagettftext (
        $img,        //画布资源
        $fontSize,  //文字大小
        mt_rand(0,20) - mt_rand(0,25),            //随机设置文字倾斜角度
        $fontSize*$i+20,mt_rand($img_h/2,$img_h), //随机设置文字坐标，并自动计算间距
        $fontColor,  //文字颜色
        $fontStyle,  //文字字体
        $code[$i] 	 //文字内容
        );
}

//为验证码图片生成彩色噪点
for($i=0; $i<300; ++$i){
    //随机生成颜色
    $color = imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    //随机绘制干扰点
    imagesetpixel($img,mt_rand(0,$img_w),mt_rand(0,$img_h),$color);
}

//绘制干扰线
for($i=0; $i<10; ++$i){
    //随机生成干扰线颜色
    $color = imagecolorallocate($img,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));
    //随机绘制干扰线
    imageline($img,mt_rand(0,$img_w),0,mt_rand(0,$img_h*5),$img_h,$color);
}

header('Content-Type: image/gif'); //输出图像
imagegif($img);

6. Create login_db_connect.php for database connection

There are many ways to connect to the database, such as PDO connection, interested friends can learn by themselves

<?php
//用于登录界面数据库连接
//设置字符集
header('Content-type:text/html;charset=utf8');

//连接数据库
$con=mysqli_connect("localhost","root","Huawei@123","LMS");//此处root为登录mysql的用户名，其后依此是密码与数据库名称
if (mysqli_connect_errno($con))
{
    echo "连接 MySQL 失败: " . mysqli_connect_error();
} 
R

*Note: For study reference only, please indicate the source for reprinting. Thanks for the support.

Source code download

https://url79.ctfile.com/d/33928079-50033272-dfd303?p=7430 (access password: 7430)

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Origin blog.csdn.net/m0_53649704/article/details/125883005
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