php用户登入与注销(session) 完整代码

php用户登入与注销(session)

  • 文件

    • index.php (主页)

      <?php
      	//开始会话
          session_start();
          header('Content-type:text/html;charset=utf-8');    
          if(isset($_SESSION['username']) ){
              echo "您好!{$_SESSION['username']},欢迎回来!";
              echo "<a href='logout.php'>注销</a>";
          }  else {
              echo "<a href='login.php'>请登入</a>";
          }
      ?>
      <html>
      </p>
      	用户信息:
      	<?php
      		if(isset($_SESSION['username']) ){
              echo $_SESSION['username'];
         }	
      	?>
      </html>
    • login.php (登录页面)

      <?php
          session_start();
          header('Content-type:text/html;charset=utf-8');   
          if(isset($_SESSION['username']) ){
              exit('您已经登入了,请不要重新登入');
          }
          if(isset($_POST['submit'])){
          	//包含数据库连接文件
      		include 'conn.php';    	
          	$result=mysqli_query($conn,"select * from user where username ='{$_POST['username']}' ");//查出对应用户名的信息,
          	while ($row=mysqli_fetch_array($result)) {//while循环将$result中的结果找出来 
            		$dbusername=$row["username"]; 
            		$dbpassword=$row["password"]; 
         		}   	
         		
              if(isset($_POST['username']) && isset($_POST['password']) && $_POST['username']== $dbusername && $_POST['password']==$dbpassword ){
                      $_SESSION['username']=$_POST['username'];
                      header('location:skip.php?url=index.php&info=登入成功!3秒后跳转到首面');
                  
              }  else {
                  header('location:skip.php?url=login.php&info=对不起,用户名活密码填写错误!3秒后跳转到登入页面');
              }
          }
      ?>
      <!DOCTYPE html>
      <html lang="zh-CN">
          <head>
              <meta charset="utf-8">
              <title>请登入</title>
          </head>
          <body>
              <form method="post" action="">
                  姓名:<input type="text" name="username" />
                  密码:<input type="password" name="password"/>
                  <input type="submit" name="submit" value="登入"/>
              </form>
          </body>
      </html>
    • conn.php (数据库连接文件)

      <?php
      //数据库连接
      $conn = mysqli_connect('localhost','root','root','tuiguang')or ('error');
      ?>
    • logout.php (登出页面)

      <?php
          session_start();
          header('Content-type:text/html;charset=utf-8');
          if(isset($_SESSION['username']) ){
                  session_unset();//free all session variable
                  session_destroy();//销毁一个会话中的全部数据
                  setcookie(session_name(),'',time()-3600);//销毁与客户端的卡号
                  header('location:skip.php?url=index.php&info=注销成功,正在跳转!');
              }else{
                  header('location:skip.php?url=index.php&info=注销失败,请稍后重试!');
              }
      ?>
    • skip.php (跳转页面)

      <?php
          if(!isset($_GET['url']) || !isset($_GET['info'])){
              exit();
          }
      ?>
      <!DOCTYPE html>
      <html>
          <head>
              <meta charset="utf-8">
              <meta http-equiv="refresh" content="3,URL=<?php echo $_GET['url'] ?>"/>
              <title>正在跳转中...</title>
          </head>
          <body>
              <div><?php echo $_GET['info'] ?></div>
          </body>
      </html>
  • 数据库

    • 数据库 tuiguang
    • 用户名 root
    • 密码 root
    • 数据库地址 localhost
    • 表 user

注意

会话使用前需先开始会话:session_start();

github地址:

https://github.com/eyunzhu/php/tree/master/login

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