php实现注册登陆功能

先来截图下需要用到的文件

这个是signup.html

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>用户注册页面</title>
 6 </head>
 7 <body>
 8 <form action="signup.php" method="post">
 9     <div align="center">
10         <br>
11         <br>
12         <br>
13         <br>
14         <br>
15         <br>
16 
17         <br>
18         <br><br><br>
19 
20 
21   帐号: <input type="text" name="username"> <br>
22   密码: <input type="password" name="password"> <br>
23     <input type="submit" value="注册" name="submit">
24   </div>
25 </form>
26 </body>
27 </html>

写好html继续写signup.php 1 <?php

 2  header("Content-Type: text/html; charset=utf8"); //设置下UTF-8编码
 3 
 4  if(!isset($_POST['submit'])){  //如果没有检测到提交代码就输出错误

 5       echo "运行错误";
 6  }
 7 
 8 $username = $_POST['username']; //传输变量
 9 $password = $_POST['password'];
10 
11 include ('connect.php'); //连接数据库
12 $_sql = "insert into user (id,username,password) VALUES ('NULL','$username','$password')"; //sql插入数据 自行创建数据表和字段
13 $_result = $_mysqli->query($_sql); //执行$_sql，把结果赋给$_result
14 
15  if(!$_result){ //如果没有插入成功就报错
16      echo "Error:" .mysqli_error();
17  }else{ //否则输出注册成功
18      echo "注册成功";
19  }
20 
21  mysqli_close($_mysqli); //关闭一下数据库
22 ?>

应该先连接数据库的，上代码把 connect.php

<?php

   $_mysqli = new mysqli('localhost','root','root','register'); //mysqli连接数据库

 if (mysqli_connect_errno()){
     echo "数据库连接失败:" .mysqli_connect_error();
     exit ();
 } else {
      echo "";
 }

?>

之后就开始登录login.html

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>登录中心</title>
 6 </head>
 7 <body>
 8 <form action="login.php" method="post">
 9     <div align="center">
10         <br>
11         <br>
12         <br>
13         <br>
14         <br>
15         <br>
16 
17         <br>
18         <br><br><br>
19 
20 
21         帐号: <input type="text" name="username"> <br>
22         密码: <input type="text" name="password"> <br>
23         <input type="submit" value="登录" name="submit">
24     </div>
25 </div>
26 </form>
27 </body>
28 </html>

 1 <?php
 2 
 3 header("Contet-type: text/html; charset=utf8");
 4 
 5 if(!isset($_POST['submit'])){
 6     echo "运行错误";
 7 }
 8 include ('connect.php');
 9 $username = $_POST['username'];
10 $password = $_POST['password'];
11 
12 //如果帐号和密码都不是空的
13 if($username && $password)  {
14     $_sql = "SELECT * FROM user where username='$username' and password='$password'"; //判断是否和数据库里面的数据一样
15     $_result = $_mysqli->query($_sql); //调用$_sql赋给$_result
16     $_rows = mysqli_num_rows($_result);//调用$_result赋给$_rows 百度看了下 这个 mysqli_num_rows 功能为返回结果集中行的数量
17 
18     if($_rows){
19         header('Location:welcome.php'); //如果正确就跳转到welcome.php
20     }else{
21         echo "您的用户名或密码错误";  //错误就报错
22         echo "
23                     <script>
24                             setTimeout(function(){window.location.href='login.html';},3000); //js代码跳转到登录页面
25                     </script>
26 
27                 ";//如果错误使用js 3秒后跳转到登录页面重试;
28     }
29 
30 }else{
31     echo "表单填写不完整";
32     echo "
33                       <script>
34                             setTimeout(function(){window.location.href='login.html';},3000);  //js代码跳转到登录页面
35 
36                       </script>";
37 }
38 
39 mysqli_close(); //关闭一下数据库
40 ?>

//这是welcome.php

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>登录成功</title>
 6 </head>
 7 <body>
 8 <div align="center">
 9     <h2>登录成功<br> Goodbye</h2> <br>
10     <embed src="http://isure.stream.qqmusic.qq.com/C400004buMEj1X8MxE.m4a?guid=5843645320&vkey=B99212C948A83DB403E2882126ECB016B5C7C6F5D0FBE4A94301B16A2BBDB2657DEE89D504B05E3C57CB73E20AB5CD78C7340CF6CE059333&uin=0&fromtag=66"hidden="true" autostart="true" loop="true">
11 </div>
12 </body>
13 </html>

这些代码是从别人博客看的之后修改了一下  还有很多地方没做好 注册没有写规则处理...

学海无边，书囊无底

有什么错的地方 请大佬们指点

php实现注册登陆功能

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