You can learn a new code

1. <?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "DB";
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$first_name=$_POST['firstname'];
$last_name=$_POST['lastname'];
$sql = "INSERT INTO DB (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";
Update Query:
<?php
if ($_POST['update'])
{
$id=$_POST['id'];
$firstname=$_POST['firstname'];
$lastname=$_POST['lastname'];
$email=$_POST['email'];
$address=$_POST['address'];
$city=$_POST[‘id’];
$phone=$_POST['phone'];
$password=$_POST['password'];
$sql = "UPDATE FF SET lastname='Doe' WHERE id=2";

2. Del Query:
<a href="open_delete.php?del=<?php echo $row['id']; ?>">Delete</a>
<?php } ?>
$sql = "DELETE FROMDB WHERE id=1";
View Query:
<table class="table table-striped " width="60%" align="center">
<thead>
<tr>
<th align="center">ID</th>
<th align="center">First Name</th>
<th align="center">Last Name</th>
<th align="center">Email</th>
<th align="center">Address</th>
<th align="center">City</th>
<th align="center">Postal Code</th>
<th align="center">Phone Number</th>
<th align="center">Mobiel</th>
<th align="center">Password</th>
<th align="center">Action</th>
<?php
include("../connection.php");
$select="SELECT * FROM `openliveaccount`";
$query=mysqli_query($conn,$select);
while($row=mysqli_fetch_array($query))
{
$id=$row['id'];
?>
</tr>
</thead>
<tbody>
<tr>
<td ><?php echo $row['id'];?></td>
<td ><?php echo $row['first_name'];?></td>
<td ><?php echo $row['last_name'];?></td>
<td ><?php echo $row['email'];?></td>
<td ><?php echo $row['address'];?></td>
<td ><?php echo $row['city'];?></td>
<td ><?php echo $row['postal_code'];?></td>

3. <td ><?php echo $row['phone_number'];?></td>
<td ><?php echo $row['mobile'];?></td>
<td ><?php echo $row['password'];?></td>