php - 如何在php中创建用户名 session ？

Question

我在我的项目中使用核心 php 和 mysql。我陷入了 session 部分。我无法理解如何为用户名创建 session 以在登录后显示他的名字。我尝试了很多次但都失败了。请帮助我。下面是我的 insertUser.php 代码。其中总共有 3 个登录查询。我正在处理 super 管理员的第二个查询。正如您在我的代码中注意到的那样，我为 super 管理员的用户名创建了 session 。我在 home.php 中包含了 menubar.php 、 header.php 和 sidebar.php 。我想在menubar.php和header.php中添加 session 。

插入用户.php

<?php
include 'db.php';
if (isset($_REQUEST['insert'])) 
    {
        $acc_name = $_REQUEST['username'];
        $acc_email = $_REQUEST['email'];
        $acc_pass = $_REQUEST['password'];
        $role_id = $_REQUEST['roleid'];
        $sql = mysqli_query($conn,"INSERT INTO `accountants`(`acc_name`, `acc_email`, `acc_pass`, `roleId`) VALUES ('".$acc_name."','".$acc_email."','".$acc_pass."','2')");
        if ($sql>0) 
            {
                header('Location: home.php');
                echo 'data added successfully';
            }
        $row = mysqli_query('SELECT * FROM `accountants`');     
        $data = mysqli_fetch_array($row);
        $data = mysqli_num_rows($conn,$data);
        $_SESSION['role'] = $data['roleId'];
    }
if (isset($_REQUEST['submit'])) 
{
        $username = $_REQUEST['user'];
        $password = $_REQUEST['pass'];
        $sql = mysqli_query($conn,"SELECT * FROM `accountants` where `acc_email` = '".$username."' AND `acc_pass` = '".$password."'");
        $data = mysqli_fetch_array($sql);        
        $_SESSION['role']=$data['roleId'];
        $_SESSION['username']=$data['acc_name'];
        $sql1 = mysqli_query($conn,"SELECT * FROM `superadmin` where `username` = '".$username."' AND `password` = '".$password."'");
        $data02 = mysqli_fetch_array($sql1);        
        $_SESSION['role']=$data02['roleId'];

        $sql2 = mysqli_query($conn,"SELECT * FROM `member` where `email` = '".$username."' AND `password` = '".$password."'");
        $data01 = mysqli_fetch_array($sql2);        
        $_SESSION['role']=$data01['roleId'];
        $_SESSION['username']=$data01['fname'];
        if ($data01>0) 
        {
            header('Location: DigitalSociety - Member/production/societyList.php');    
        }
        elseif ($data>0) 
            {
                header('Location: societyList.php');
            }
       elseif ($data02>0) {
            $_SESSION['login_user']=$username;
                header('Location: DigitalSociety - Superadmin/production/societyList.php');
       }

       else
            {
                header('Location: index.php');
                echo 'incorrect login';
            }
}
?>

菜单栏.php

<div class="profile clearfix">
  <div class="profile_pic">
    <img src="images/img.jpg" alt="..." class="img-circle profile_img">
  </div>
  <div class="profile_info">
    <span>Welcome,</span>
    <h2><?php echo $_SESSION['login_user'];?></h2>
  </div>
</div>

我使用上面的代码来显示用户名，它显示错误 Undefined variable: _SESSION in

请帮助我。

Answer 1

您的文件顶部缺少 session_start();。