hapus tugas php

<?php
    include('config.php');

    if ( !isset($_GET['id']) ) {
        header('Location: list-siswa.php');
    }

    //ambil data dari url
    $id = $_GET['id'];
    $sql = 'DELETE FROM calon_siswa WHERE id='.$id;
    $query = mysqli_query($db_connection, $sql);

    if ($query) {
        header('Location: list-siswa.php?status=sukses-hapus');
    }else {
        header('Location: list-siswa.php?status=gagal-hapus');
    }
?>