array uit object halen

<?php
public function categories()
{
	$sql1 ="
	SELECT c.id, c.name, c.description, c.position, 
	(SELECT count(t.id) 
	FROM topics as t 
	WHERE t.parent=c.id and t.id2=0) as topics, 
	(SELECT count(t2.id) 
	FROM topics as t2 
	WHERE t2.parent=c.id and t2.id2!=0) as replies 
	FROM categories as c 
	GROUP BY c.id 
	ORDER BY c.position ASC 
	";
	$result1 = mysqli_query($this->reg, $sql1); 
	$numrows1 = mysqli_num_rows($result1);

/*while ($row=....) 
{
echo $row['cat'];
}
*/


}
?>

<?php 
$forum = new forum; 
$categories = $forum->categories();

foreach ($categories as $category) {
    echo '<span>' . $category['name'] . '</span>';
}
?>