<?php
$cat = Categories::getAll();
usort($cat, function($a, $b){
    return strcmp($a->name, $b->name);
});
foreach($cat as $category){
    //print_r($category);
    $category_name = $category->name;
    echo "<a href='index.php?catid={$category->category_id}'>".$category->name."</a>";
    echo "<br>";
}
?>