modificar + eliminar cancion

if(isset($_POST['btnModificarCancion'])){

                         $idcan= $_POST['idcan'];
                         $nuevonombrecan = $_POST['nuevonombrecan'];

                         $sql = "UPDATE cancion SET nombre_cancion='$nuevonombrecan' WHERE id_cancion = '$idcan'";

                         $agregar = $mysqli->query($sql);

                         if ($agregar === TRUE) {
                            header('Location: admin-contenido.php?done=modcan');
                        } else {
                            header('Location: admin-contenido.php?done=nomodcan');
                        }
             }


             if(isset($_POST['btnModificarCancionurl'])){

                         $idcan= $_POST['idcan'];
                         $nuevaurlfull = $_POST['nuevaurlfull'];

                         $sql = "UPDATE cancion SET url_cancion ='$nuevaurlfull'WHERE id_cancion = '$idcan'";

                         $agregar = $mysqli->query($sql);

                         if ($agregar === TRUE) {
                            header('Location: admin-contenido.php?done=modcan');
                        } else {
                            header('Location: admin-contenido.php?done=nomodcan');
                        }
             }


             if(isset($_POST['btnModificarCancionDestacada'])){

                         $idcan= $_POST['idcan'];
                         $nuevodestacado = $_POST['nuevodestacado'];

                         $sql = "UPDATE cancion SET destacada='$nuevodestacado' WHERE id_cancion = '$idcan'";

                         $agregar = $mysqli->query($sql);

                         if ($agregar === TRUE) {
                            header('Location: admin-contenido.php?done=modcan');
                        } else {
                            header('Location: admin-contenido.php?done=nomodcan');
                        }
             }

             if(isset($_POST['btnModificarCancionAlbum'])){

                         $idcan= $_POST['idcan'];
                         $nuevoalbum = $_POST['nuevoalbum'];

                         $sql = "UPDATE cancion SET id_album='$nuevoalbum' WHERE id_cancion = '$idcan'";

                         $agregar = $mysqli->query($sql);

                         if ($agregar === TRUE) {
                            header('Location: admin-contenido.php?done=modcan');
                        } else {
                            header('Location: admin-contenido.php?done=nomodcan');
                        }
             }


             if(isset($_POST['btnEliminarCancion'])){

                         $idcan = $_POST['idcan'];

                         $sql = "DELETE FROM cancion WHERE id_cancion = '$idcan'";

                         $agregar = $mysqli->query($sql);

                         if ($agregar === TRUE) {
                            header('Location: admin-contenido.php?done=delcan');
                        } else {
                            header('Location: admin-contenido.php?done=nodecan');
                        }
             }