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PHP user login and verification code examples

WBOYOriginal: 2016-07-25 08:58:391047browse

This article introduces a piece of code for user login and verification using PHP. Friends in need can refer to it.

1. Login page Login.html submit form

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb232">
<title>注册用户登录页面_bbs.it-home.org</title>
</head>
<body>
<h1>程序员之家，欢迎大家的光临。</h1>
<div>
 <form  action="login.php" method="post">
  用户名：<input type="text" name="username" >
  密码：<input type="password" name="password" >
  <p>
   <input type="submit" name="login" value="登陆" >
   <input type="submit" name="zhuce" value="注册">
   </p>
 </form>
</div>
</body>
</html>

2. Login program login.php

<?php
/**
* 用户登录验证代码
* edit bbs.it-home.org
*/
 require_once ("conn.php"); //引入数据库操作文件
 
 $username=$_POST["username"];
 $password=$_POST["password"];
  if(!isset($username) || !isset($password))
   {
   echo"没有用户名或者密码";
   exit();
   }
  else{

//验证用户的合法性
//连接数据库
   $sql="select * from 'user_table' where user_name='$username' ";
   $result=mysql_query($sql);
   if(!$result)
  {
   echo"没有此人";
   exit();
  }
  else
  { 
   $row=mysql_fetch_array($result);
   if($password!=$row["password"])
   {
    echo"密码错误";
   }
   else {
      echo"登陆成功！";
      exit();
   }
  } 
  }    
?>

3. Database call file conn.php

<?php
/**
* mysql数据库调用
* edit bbs.it-home.org
*/
$link= mysql_connect("localhost","root","123");
 if(!$link)
{
    echo"没连接上";
}
else
{
 $con=mysql_select_db("test");
 if(!$con)
 {
 echo"没连接上test";
 } 
}
?>

That’s it, three simple files to implement PHP user login and simple verification. For those who are new to PHP, it can be used as an introductory reference.

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