halo teman-teman, saya ad buat fungsi delete nii, tp knp data nya ga terhapus ya?? terimasih

data

 <tr>
                                            <td><?=$i++;?></td>
                                            <td><?=$username;?></td>
                                            <td><?=$email;?></td>
                                            <td><?=$alamat;?></td>
                                            <td><?=$no_hp;?></td>
                                            <td>
                                                <button type="button" class="btn btn-secondary">Edit</button>
                                                <a href="delete.php"><button type="button" class="btn btn-danger">Hapus</button>
                                            </td>
                                        </tr>
                                        <?php
                                            };
                                        ?>
                                    </tbody>

koneksi

<?php
include "mysql_mysqli.inc.php";
session_start();

//koneksi
$conn = mysqli_connect("localhost","root","","db_komkordik");
if(mysqli_connect_errno()) {
    echo mysqli_connect_error();
}

function base_url($url = null) {
    $base_url = "http://localhost/komkordik";
    if($url != null) {
        return $base_url."/".$url;
    } else {
        return $base_url;
    }
}
?>

delete

<?php
include "mysql_mysqli.inc.php";
include 'function.php';

if(isset($_GET['id_dokter'])){
    $delete = mysqli_query($conn,"DELETE FROM kom_dokter WHERE id_dokter = '".$_GET['id_dokter']."' ");
    header('location:index.php');
}

?>

hasil

image.png