CRUD OOP - aksi

<?php
//memasukan file core
include "core.php";
//instanisasi class core
$core = new core();

$aksi = $_GET["aksi"];
if($aksi == 'create'){
    $core->create($_POST['nim'],$_POST['nama']);
    header("location:index.php?success");
}else if($aksi == 'delete'){
    $id_delete = $_GET['id'];
    $core->delete($id_delete);
    header("location:index.php?success");
}else if($aksi == 'update'){
    $id_update = $_POST['id'];
    $core->update($id_update,$_POST['nama'],$_POST['nim']);
    header("location:index.php?success");
}
 ?>