How iterate a fetch_assoc() array? - php

Question

Im a very novice programmer, i work with PHP and a have a doubt/problem with fetch_assoc().
I have this method that return the result of the database consult:
public function getUsuarios() {
try {
$resultado = $this->conexion->query("SELECT * FROM login_usuarios");
} catch(Exception $e) {
throw new Exception("Error al obtener los usuarios de la base de datos. Código de error: ".mysqli_errno);
} finally {
if($this->conexion != null) {
$this->conexion->close();
}
}
return $resultado;
}
This script iterate and show the data of the database consult's result:
<table>
<tr>
<td>Código</td>
<td>Nombres</td>
<td>Apellidos</td>
</tr>
<?php while ($fila = mysqli_fetch_array($usuarios)) { ?>
<tr>
<td><?php print($fila['codUsuario']); ?></td>
<td><?php print($fila['nombres']); ?></td>
<td><?php print($fila['apellidos']); ?></td>
</tr>
<?php
}
$usuarios->free();
?>
</table>
With this way, all worked fine (but i don't understand what xD, i've see this way in a forum).
But, i've see other way in many sites. With this way the script stand like this:
// first convert the result to a fetch_assoc
$usuarios = (new Consultas)->getUsuarios()->fetch_assoc();
<table>
<tr>
<td>Código</td>
<td>Nombres</td>
<td>Apellidos</td>
</tr>
<?php foreach ($usuarios as $fila) { ?>
<tr>
<td><?php print($fila["codUsuario"]); ?></td>
<td><?php print($fila["nombres"]); ?></td>
<td><?php print($fila["apellidos"]); ?></td>
</tr>
<?php
}
$usuarios->free();
?>-->
</table>
But with this way i have a Illegal string offset mysql. This looks like the foreach iterate on each column and not on each row.
Why the first way works and the second way don't?, How works mysqli_fetch_array($result) and fetch_assoc()?
Thanks for help.

Answer 1

Construction finally closes connection before your call fetch_assoc().
Try to comment $this->conexion->close();.
Your code iterates through row. mysqli_result::fetch_assoc return only one row. Please, read the documentation.