PHP登录session验证实例

创建时间：2016-03-23 投稿人：浏览次数：254

界面：

<html>
 <head> 
  <title>Login</title> 
 </head> 
 <body> 
  <form name="fangbei" method="post" action="check_session_login.php"> 
   <div style="width:353"> 
    <dl> 
     <dt></dt> 
     <dd>
      <div align="left">
       Username:
       <input type="text" name="username" />
      </div>
     </dd> 
     <dd>
      <div align="left">
       Password : 
       <input type="password" name="pwd" />
      </div>
     </dd> 
     <dd> 
      <p align="center"> <input type="submit" name="Submit" value="Submit" /> <input type="reset" name="Reset" value="Reset" /> </p>
     </dd> 
    </dl> 
   </div> 
  </form>  
 </body>
</html>

数据库准备：

username	pwd	userflag
perry	123	1

登录验证：

<?php
header("Content-Type: text/html; charset=utf-8");
$servername="localhost";
$username = "root";
$password = "";
$dbname = "paul";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
$conn->query("SET NAMES utf8");
//获取输入的信息
$username = $_POST["username"];
$pwd = $_POST["pwd"];
//获取session的值
$sql = "select username,userflag from test_login where username = "$username" and pwd = "$pwd"";
$result = $conn->query($sql);
//判断用户以及密码
if ($result->num_rows > 0) {

    session_start();
    //判断权限
    $row = $result->fetch_assoc();
    if($row["userflag"] == 1 or $row["userflag"] == 0){
        $_SESSION["username"] = $row["username"];
        $_SESSION["userflag"] = $row["userflag"];
        echo "<a href="welcome_session_login.php">欢迎访问</a>";
    }
    else{
        echo "迷之用户";
    }

}
else{
    echo "用户名或密码不正确";
}

欢迎界面：

<?php
header("Content-Type: text/html; charset=utf-8");
session_start();
if(isset($_SESSION["username"]))
{
    if($_SESSION["userflag"] == 1)
        echo "欢迎管理员".$_SESSION["username"]."登录";
    if($_SESSION["userflag"] == 0)
        echo "欢迎用户".$_SESSION["username"]."登录";
}
else
{
    echo "登录已过期";
}
unset($_SESSION["username"]);
unset($_SESSION["pwd"]);
unset($_SESSION["userflag"]);
echo "<br>会话结束";

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