User Update Page in PHP. College notes management section

 <?php

      include 'conn.php';
    ?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bookstore</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
    <!-- contact section -->
<section id="contact" class="py-5 bg-warning mt-3">
  <div class="container">
    <!-- title contact -->
     <!-- title -->
     <div class="row">
      <div class="col text-center ">
       <h1 class="display-4 text-uppercase mb-0  ">
        <strong>User Upadte </strong>
       </h1>
        <div class="title-underline bg-danger"></div>
        <!-- <p class="mt-2 text-capitalize text-muted">Lorem ipsum dolor sit amet.</p> -->
      </div>
    </div>
    <!-- end of title -->
    <div class="row  justify-content-center">
      <div class="col-md-6 my-3">
        <div class="card card-body bg-secondary">
          <!-- title -->
          <div class="card-title text-center text-white">
            <h1 class="text-capitalize"></h1>
            <!-- <p>Message Us</p> -->
          </div>
          <!-- end of title -->
          <form action="" method="POST" >
            <!-- simple form -->
    <?php
    $id = $_GET['id'];
    $sql = "SELECT *FROM users WHERE id = '$id' ";
    $result = mysqli_query($conn ,$sql);
    if(mysqli_num_rows($result)>0) {
        while ($user = mysqli_fetch_assoc($result)){ ?>
       
            <div class="form-group mt-3">
              <input type="text" class="form-control" name="u_name"  value="<?php echo $user['uname'] ;?> ">
            </div>
            <div class="form-group mt-3">
              <input type="text" class="form-control" name="u_email" value="<?php echo $user['uemail'] ;?>">
            </div>
            <div class="form-group mt-3">
              <input type="text" class="form-control" name="u_no" value="<?php echo $user['uno'] ;?> ">
            </div>
            <!-- email -->
            <!-- <div class="form-group mt-3">
              <input type="password" class="form-control  " name="u_pass" placeholder="password">
            </div> -->
           
           
              <!-- append -->
             
            <button type="submit" value="Update" name="update" class="btn btn-outline-dark btn-block text-uppercase">submit</button>
            <?php   }

} else{
    echo '0 result';
}
?>
          </form>
        </div>
      </div>

    <script src="js/jquery.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
   
    <?php
   if(isset($_POST['update'])) {
    $u_name = $_POST['u_name'];
    $u_email = $_POST['u_email'];
    $u_no = $_POST['u_no'];

    $sql = "UPDATE users SET uname='$u_name',uemail='$u_email',uno='$u_no' WHERE id='$id'";

    if (mysqli_query($conn,$sql)) {
        echo "<script type = \"text/javascript\">
          alert(\"Updated Succesfully \");
        window.location = (\"dash.php\")
          </script>";
    }else{
        echo "error updating record:",mysqli_error($conn);
    }
}

?>
</body>
</html>

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