尝试登录但在用户名和密码上出错 [英] Trying to login but get errors on username and password

问题描述

嗨我有一个登录表单，我正在尝试登录，但是用用户名和密码出现了这些错误。

（！）注意：未定义的索引：第6行的C：\ wamp64 \ #\\\FormTutorial \ php \ lunana_login.php中的用户名

（！）注意：未定义的索引：第7行的C：\ wamp64 \\\\\\\\\\\\\\\\\\\\\\\ pre> 
 
 
 
有人能指出我正确的方向来解决这个问题。这就是我的尝试
 
 
 
 我尝试过： 
 
 
 
 
 <   pre  > ;  <？ php 
 
 
  //  从表单捕获值并存储在php变量中 
 
 $ username = $ _ POST ['  用户名']; 
 $ password = $ _ POST ['  password']; 
 
  //  与数据库的连接 
 
 $ db_host = '  localhost'; 
 $ db_username = '  root'; 
 $ db_password =  ; 
 $ con = mysqli_connect（$ db_host，$ db_username，$ db_password）或 die（mysqli_connect_error（））; 
 
  //  选择要查询的数据库 
 mysqli_select_db（$ con，'  staff'）或 die （mysqli_error（$ CON））; 
 $ sql =   SELECT * FROM applicant WHERE username ='$ username'AND password = md5（'$密码'）; 
 $ result = mysqli_query（$ con，$ sql）或 die（ 错误： .mysqli_error（$ con））; 
 $ rowcount = mysqli_num_rows（$ result）; 
 
 if（$ rowcount == 1）
 {
 session_start（）; 
 $ _SESSION ['  user'] = $ username; 
 header（  location：luana_profile.php）; 
} 
 其他 
 {
  echo   < script type = \text / javascript\> 
 alert（'username and password doesn 't exists'）; 
 window.location \../ xhtml / luana_login.html\; 
< / script>; 
} 
 mysqli_close（$ con）; 
 
 
 ？>  
 
解决方案
 
 username = 
 
 
 _POST ['  username'] ; 
 
 
密码= 
 
 
hi i have a login form where i am trying to login but got these errors with the username and password.



( ! ) Notice: Undefined index: username in C:\wamp64\www\FormTutorial\php\luana_login.php on line 6






( ! ) Notice: Undefined index: password in C:\wamp64\www\FormTutorial\php\luana_login.php on line 7




can someone point me in the right direction on how to fix this. this is what I have tried



What I have tried:



<pre><?php

	
		// capture values from the form and store in php variables
		
		$username=$_POST['username'];
		$password=$_POST['password'];
		
		//connection to the database
		
		$db_host='localhost';
		$db_username='root';
		$db_password="";
		$con=mysqli_connect($db_host, $db_username, $db_password) or die (mysqli_connect_error());
		
		//select the database to query
		mysqli_select_db($con, 'staff') or die (mysqli_error($con));
		$sql="SELECT * FROM applicant  WHERE username ='$username' AND password=md5('$password')";
		$result=mysqli_query($con,$sql) or die ("Error:" .mysqli_error($con));
		$rowcount=mysqli_num_rows($result);
		
		if($rowcount == 1)
		{
			session_start();
			$_SESSION['user']=$username;
			header("location:luana_profile.php");
		}
		else
		{
			echo"<script type=\"text/javascript\">
			alert('username and password doesn't exist');
			window.location\"../xhtml/luana_login.html\";
			</script>";
		}
		mysqli_close($con);
		
	
?>
解决方案
username=

_POST['username'];

password=


                        
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