botones modificar

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

                 $oldemail = $_POST['oldemail'];
                 $email = $_POST['email2'];
                 $password = $_POST['password2'];

                 $hidepass = hash("sha256", $password);

                 $sql = "UPDATE usuario SET email='$email', password='$hidepass' WHERE email = '$oldemail'";

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

                 if ($agregar === TRUE) {
                    header('Location: admin-user.php?done=mod');
                } else {
                    header('Location: admin-user.php?done=nomod');
                }
     }

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

                 $oldemail = $_POST['oldemailp'];
                 $nombre = $_POST['nombre2p'];
                 $apellido = $_POST['apellido2p'];

                 $sql = "UPDATE usuario SET nombre='$nombre', apellido='$apellido' WHERE email = '$oldemail'";

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

                 if ($agregar === TRUE) {
                    header('Location: admin-user.php?done=mod');
                } else {
                    header('Location: admin-user.php?done=nomod');
                }
     }

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

                 $oldemail = $_POST['oldemail'];
                 $email = $_POST['email2'];
                 $tipouser = $_POST['tipousuario2'];

                 $sql = "UPDATE usuario SET tipo_usuario='$tipouser' WHERE email = '$oldemail'";

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

                 if ($agregar === TRUE) {
                    header('Location: admin-user.php?done=mod');
                } else {
                    header('Location: admin-user.php?done=nomod');
                }
     }