<?php
// $mysqli is already declared as a working database connection by this sandbox
$sql = <<<SQL
SELECT *
FROM your_table
ORDER BY lastname, firstname
SQL;
foreach ($mysqli->query($sql) as $i => $row) {
printf(
"<div>%d: %d, %s, %s</div>\n",
$i + 1,
$row['id'],
$row['firstname'],
$row['lastname']
);
}