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How to implement PHP login failure page prompt

藏色散人Original: 2022-11-19 10:13:562679browse

php method to implement login failure page prompts: 1. Create the login.php login page; 2. Determine the prompt information through the error value; 3. Through "function chkinput($x,$y){.. .}" method to determine whether the login is successful and jump to the corresponding prompt page.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How to implement the prompt on the php login failure page?

An example of the login page information prompt function implemented in PHP

is as follows:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="check_login.php" name="loginform"  method="post">
帐号：
  <input type="text" name="name" />
密码：
  <input type="password" name="pwd" />
<input type="submit" value="登 录" />
</form>
<?php
echo "<br/>";
//通过 error 值，确定提示信息
if(!empty($_GET[&#39;error&#39;])){
  $error=$_GET[&#39;error&#39;];
  If($error==1){
    Echo "<font color =&#39;red&#39;>您输入的账号或密码错误！</font>";
  }elseif ($error==2){
    Echo "<font color =&#39;red&#39;>您输入的账号或密码正确！</font>";
  }
}
?>
</body>
</html>

check_login.php:

<?php
header("Content-type: text/html; charset=utf-8");
session_start(); //初始化session变量
$username = $_POST[&#39;name&#39;]; //接收表单提交的用户名
$password=md5($_POST[&#39;pwd&#39;]); //接收表单提交的密码
class chkinput  //定义类
{
  var $name;
  var $pwd;
  function chkinput($x,$y) //定义一个方法
  {
    $this->name=$x; //将管理员名称传给类对象$this->name
    $this->pwd=$y; //将管理员密码传给类对象$this->pwd
  }
  function checkinput()
  {
    include("conn.php"); //连接数据库文件
    $sql=mysql_query("select username,password from admin where username=&#39;".$this->name."&#39; and password=&#39;".$this->pwd."&#39;",$conn);
    $info=mysql_fetch_array($sql); //检索管理员名称和密码是否正确
    if($info==false) //如果管理员名称或密码不正确，则弹出相关提示信息
    {
      header("location:login.php?error=1");
      exit;
    }
    else //如果管理员名称或密码正确，则直接跳转到登陆成功后界面
    {
      header("location:login.php?error=2");
      $_SESSION[&#39;admin_name&#39;]=$info[&#39;username&#39;]; //将管理员名称存到$_SESSION[admin_name]变量中
      $_SESSION[&#39;pwd&#39;]=$info[&#39;password&#39;]; ////将管理员名称存到$_SESSION[pwd]变量中
    }
  }
}
$obj=new chkinput(trim($username),trim($password)); //创建对象
$obj->checkinput(); //调用类
?>

conn.php:

<?php
header("Content-type: text/html; charset=utf-8");
$conn = mysql_connect("localhost","root","111111");
if(!$conn)
{
  die("连接数据库失败".mysql_error());
}
mysql_select_db("design") or die("数据库选择失败".mysql_error());
mysql_query("set names &#39;uft8&#39;");
?>

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