<?php
$cat = Categories::getAll();
usort($cat, function($a, $b){
        return strcmp($a->name, $b->name);
});
$current_letter = "";
foreach($cat as $category){
        //print_r($category);
        $category_name = $category->name;
        $first_letter = substr($category_name,0,1);
        if($first_letter!=$current_letter){
            echo '<b>'.$first_letter.'</b><br />';
            $current_letter = $first_letter;
        }
        echo "<a href='index.php?catid={$category->category_id}'>".$category->name."</a>";
        echo "<br>";
}
?>