NULL given on fetch variable, while using MVC in php [closed] - php

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I have a database, and i'm using the MVC method in php (Model View Contol).
Basically i made the three, the view (while i fetch the data from the SQL query) and the controller/model, however it gives me NULL, and i don't know why.
I want to be able to print in a table the data i get from the select made in the model. However i can't, i have been doing var_dump several times but it doesn't print anything but in the view only NULL.
Here is the model code file:
`<?php
require_once "database.php";
class alumno_model extends database{
function desplegarAlumnosNormal(){
$query = "SELECT * FROM ALUMNOS";
//pdo query and print_r
$stmt = $this->db->prepare($query);
$stmt->execute();
var_dump($stmt);
echo $stmt;
$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
return $result;
}
}
?>`
Here is the controller file:
`<?php
class Alumno{
public function mostrarAlumnos(){
//aqui lo que hacemos es recoger los valores POST, creamos una instancia de insertarModel y luego
require_once "../models/alumno_model.php";
$alumno = new alumno_model();
$mostrarTodos= $alumno->desplegarAlumnosNormal();
require_once "../views/verTodosLosAlumnos.php";
}
}
?>`
And, finally, here is the view file, which doesn't print any data due to the NULL value:
`<?php
echo '<table class ="centrar" border = 1px solid black>';
echo '
<th>ID_ALUMNO</th>
<th> DNI</th>
<th>NOMBRE</th>
<th> APELLIDO </th>
<th> FOTO</th>
<th> CONTRASENYA </th>
';
foreach ($mostrarTodos as $row ) {
echo '
<tr>
<td>' . $row['ID_ALUMNO'].'</td>
<td>' . $row['DNI'] . '</td>
<td>' . $row['NOMBRE'] . '</td>
<td>' . $row['APELLIDO']. '</td>
<td>' . $row['FOTO']. '</td>
<td>' . $row['CONTRASENYA'] . '</td>
<td>editar</td>
<td>eliminar</td>
</tr>';
}
echo '</table>';
?>`
CLARIFICATION:
The part that gives me NULL is the variable $mostrarTodos, which then its results are saved in $row, but it doesn't print anything but NULL