I can't select my users level from the DB, codeigniter - php

Question

im trying to get from my DB, the levels from a users, and print them in a view, but i cant do it.
Controller:
public function add_notificacion() {
$data = array();
if (!empty($this->input->post('mensaje', TRUE))) {
if (($this->input->post('id_profesor', TRUE) != 0)) {
$id_profesor = $this->input->post('id_profesor', TRUE);
$this->load->model('Profesor_model', 'profesor');
$json_data = $this->profesor->gets_profesor($id_profesor);
foreach ($json_data as $fila) {
$nivel[] = $fila->id_nivel;
}
} else {
$nivel = $this->input->post('niveles', TRUE);
}
View:
div class="col-md-5 col-sm-5 col-xs-5">
<label for="niveles">Niveles</label>
</div>
<div class="col-md-14 col-sm-25 col-xs-25">
<?php if ($temp == 0) { ?>
<input id="todo" name="todo" type="checkbox"> Todos <br>
<?php } ?>
<?php
if(!empty($nivel)){
foreach ($nivel as $fila) {
if (in_array($fila->id_nivel, $id_nivel[0])) {
?>
<input disabled="disabled" id="nivel" class="che" name="niveles[]" type="checkbox" value="<?= $fila->id_nivel ?>" checked="" onclick="checkAddress(this)" style="cursor:auto;"> <?= $fila->nombre . " " . $fila->seccion ?><br>
<div id="repre"> </div>
<?php
} else {
?>
Model:
function gets_profesor($id_profesor) {
$result = $this->db->get_where('profesor', array('id_profesor =' => "$id_profesor"));
return $result->result();
}
The form just show me the "Todos" checkbox, but I need to print every "Nivel" user.

Answer 1

Sorry for my novice code but this might help.
Say if you have a table called "users" and a field called "level" and another called "username".
$getlevels = mysqli_query($con,"SELECT * FROM users");
while($r = mysqli_fetch_array($getlevels)){
$username = $r['username'];
$level = $r['level'];
echo $username," - ",$level,"<br>";
}
That will show each user and their levels afterwards