Saykot

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <?php

        $con = mysqli_connect('localhost','root','','userdb');

        if(isset($_POST["insert"])){
            $id=$_POST['user_id'];
            $name=$_POST['user_name'];
            $orderid=$_POST['userorder_id'];
            $bill=$_POST['user_bill'];
            $shippingad=$_POST['user_address'];
            $sql = "INSERT INTO user (user_id,user_name,userorder_id,user_bill,user_address)VALUES ('$id','$name','$orderid','$bill','$shippingad')";

        }

        if(isset($_POST["update"])){

            $id=$_POST['user_id'];
            $name=$_POST['user_name'];
            $orderid=$_POST['userorder_id'];
            $bill=$_POST['user_bill'];
            $shippingad=$_POST['user_address'];
            $sql = "UPDATE user SET user_bill='$bill',user_name='$name',userorder_id='$orderid',user_address='$shippingad' WHERE user_id='$id'";

        }

        if(isset($_POST["search"])){


            $id=$_POST['user_id'];
            $name=$_POST['user_name'];
            $orderid=$_POST['userorder_id'];
            $bill=$_POST['user_bill'];
            $shippingad=$_POST['user_address'];

            $sql="SELECT * FROM user WHERE userorder_id LIKE '%$orderid%'";
            $result=$con->query($sql);

            if ($result->num_rows > 0) {
                while($row = $result->fetch_assoc()) {
                  echo "id: " . $row["user_id"]. " - Name: " . $row["user_name"]. " " . "<br>";
                }
              } else {
                echo "0 results";
              }
              $con->close();
        }

        if(isset($_POST["delete"])){
            $id=$_POST['user_id'];
            $name=$_POST['user_name'];
            $orderid=$_POST['userorder_id'];
            $bill=$_POST['user_bill'];
            $shippingad=$_POST['user_address'];

            $sql = "DELETE FROM user WHERE user_id='$id'";
        }

    ?>
</body>
</html>


************************HTML************************

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Personal Information</title>
</head>
<body>
    <form action="./labp.php" method="POST">
        ID: <input type="number" name="user_id"><br>
        Name(Full Name): <input type="text" name="user_name"><br>
        Order id: <input type="number" name="userorder_id"><br>
        Total Bill: <input type="number" name="user_bill"><br>
        Shipping Address: <input type="text" name="user_address"><br>

        <input type="submit" name="insert" value="Insert">
        <input type="submit" name="update" value="Update">
        <input type="submit" name="search" value="Search">
        <input type="submit" name="delete" value="Delete">

    </form>

</body>
</html>