PDO MVC Echoing data from database to page - php

Question

I'm not new to PHP, but I am new to all this PDO and MVC stuff. I'm basically trying to echo out data from the database to the page.
Model (_dashboard.php)
<?php
require_once('_connection.php');
class ConnectToDB {
private $db;
public function __construct(){
$this->db =new connection();
$this->db = $this->db->dbConnection(); //uses the connection in connection class
}
public function teachersStudents($id){
// this function checks whether the user name exists and if its a match
if(!empty($id)){
$st = $this->db->prepare("SELECT * FROM students WHERE id=?");
$st->bindParam(1, $id);
$st->execute();
if ($st->rowCount() == 1) {
$result = $st->fetchAll();
foreach($result as $row){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "</tr>";
}
}
}
}
}
// Close database connection
$dbh = null;
?>
View (dashboard.phtml)
<?php
require_once('_dashboard.php');
$object = new ConnectToDB();
$object->teachersStudents($id);
echo $result;
?>
Result
Notice: Undefined variable: result
I'm probably doing this completely wrong so a push in the right direction would be appreciated. Here's the controller but really has nothing to do with it.
Controller
<?php
$view = new stdClass();
$view->pageTitle = 'Dashboard';
require_once('views/dashboard.phtml');

Answer 1

$result is undefined Change your function to return the result.
$result = $st->fetchAll();
return $result;
Then move your code to display HTML in the view instead:
require_once('_dashboard.php');
$object = new ConnectToDB();
$result = $object->teachersStudents($id);
foreach($result as $row){
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "</tr>";
}