How do I create a numbered list with PHP? [closed]

This is pure PHP.

$items = get_post_meta($post->ID, "item-specific-meta");
$item_id = 1;
$output="";
foreach ($items as $item) {
    $output .= '<label for="item-'.$item_id.'"><input id="item-'.$item_id.'"/>'.$item.'</label>';
    ++$item_id;
}

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