我尝试在基于 PHP 的网站中仅对通知使用甜蜜警报为什么我的网站上没有显示甜蜜警报通知？

如何解决我尝试在基于 PHP 的网站中仅对通知使用甜蜜警报为什么我的网站上没有显示甜蜜警报通知？

我需要在我的网站上发出甜蜜警报通知。仅显示使用警报通知，但现在显示使用 Sweetalert 通知。我尝试查看其他堆栈溢出答案，但没有用。我不知道是什么错误。我也保留了所需的脚本和 css。但是在 echo 如何显示通知？

<?PHP 
session_start();
include 'includes/connection.PHP';
$error ="";
if(isset($_POST['submit'])){  
    $user_email = $_POST['email'];
  
    if($user_email == ""){
      echo "<script>
      Swal.fire('User email required')   
      }
      })
    </script>";
    }else {      
        $pass = $_POST['password'];
        $pass =  md5($pass);
        $detail = MysqLi_select_db($conn,'Students_Jobsite');
        $detail = "SELECT * FROM users WHERE user_email = '$user_email' AND user_password = '$pass' AND user_type = 'Student' ";
        $detailqry = MysqLi_query($conn,$detail);  
        while($row = MysqLi_fetch_assoc($detailqry)){
          $uid = $row['user_id'];
          $fname = $row['user_first_name'];
          $type = $row['user_type'];
          $active = $row['active'];
          $category_id = $row['category_id']; 
        }
  
        if($detailqry->num_rows !=0){
          if($active==1){ 
            $_SESSION['user_id'] = $uid;
            $_SESSION['user_type'] = $type;
            $_SESSION['category_id'] = $category_id;
              if(strtoupper($type)=="STUDENT"){ 
                header('location:index.PHP');
              }
            else{
              echo "<script>
              Swal.fire('Invalid login')   
            }
            })
            </script>";
            }
          }  
          else{
            echo "<script>
             Swal.fire('Account not active')   
            }
          })
          </script>";
    }
  }
  else{  
    echo "<script>
      Swal.fire('Password required')   
    }
    })
    </script>";
  }
}
}
?>

<?PHP
  include 'includes/header.PHP';
?>

<section class="inner-banner" style="background:#242c36 url(images/xxxx.jpg) no-repeat">
    <div class="container">
        <div class="caption">
            <h2>Login</h2>
            <p>Get your dream jobs <span>2021</span></p>
        </div>
    </div>
</section>

<section class="login-wrapper">
    <div class="container" >
    <div class="col-md-6 col-sm-8 col-md-offset-3 col-sm-offset-2" style=" border: 2px solid white; border-style: ridge; border-radius: 12px;">
      <img class="img-responsive" alt="logo" src="images/logooo.jpg">
        <?PHP if($error == ""){        
          }else{
          echo $error;
        }?>
        <form action="" method="post">
                    <input type="email" name="email" class="form-control input-lg" placeholder="Email">
                    <input type="password" name="password" class="form-control input-lg" placeholder="Password">
          <button style="background-color:#ff8f3e;" type="submit" name="submit" value="submit" class="btn px-4 btn-primary text-white">LOGIN</button>           
                        <p>Need Help? Forgotten your <a href="new_password.PHP">Password</a></p>
            
                </form>
        </div>
    </div>
</section>
   
<?PHP include 'includes/footer.PHP'; ?>

footer.PHP

<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="//cdn.jsdelivr.net/npm/sweetalert2@11"></script>
<script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
<script type="text/javascript" src="js/jquery.convform.js"></script>
<script type="text/javascript" src="js/custom.js"></script>
<script type="text/javascript" src="js/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script type="text/javascript" src="js/owl.carousel.min.js"></script>
<script src="js/bootsnav.js"></script>
<script src="js/main.js"></script>
<script src="js/cbot.js"></script>

header.PHP

<!doctype html>
<html class="no-js" lang="en">
    <head>
        <Meta charset="utf-8">
        <Meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
        <title>Student-Friendly Jobsite</title>
        <Meta name="description" content="">
        <Meta name="viewport" content="width=device-width,initial-scale=1">
        
        <!-- All Plugin Css --> 
        <link rel="stylesheet" href="css/plugins.css">
        
        <!-- Style & Common Css --> 
        <link rel="stylesheet" href="css/common.css">
        <link rel="stylesheet" href="css/main.css">
        <link rel="stylesheet" href="css/cchatstyles.css">
         
         <!-- chatbot -->
        <link rel="stylesheet" type="text/css" href="css/style.css">
        <link rel="stylesheet" type="text/css" href="css/responsive.css">
        <link rel="stylesheet" type="text/css" href="css/jquery.convform.css">
        <link rel='stylesheet' href='https://cdn.jsdelivr.net/npm/sweetalert2@10.10.1/dist/sweetalert2.min.css'>

我尝试在基于 PHP 的网站中仅对通知使用甜蜜警报为什么我的网站上没有显示甜蜜警报通知？

如何解决我尝试在基于 PHP 的网站中仅对通知使用甜蜜警报为什么我的网站上没有显示甜蜜警报通知？

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