<?php
$grades = [
"french" => [12, 9, 13],
"english" => [18, 12, 11],
"maths" => [15, 11, 13]
];
?>
<!doctype html>
<html lang="fr">
<head>
<meta charset="utf-8" />
<title>Exercice 4</title>
</head>
<body>
<h1>
Liste des notes
</h1>
<ul>
<?php foreach($grades as $subject => $results) { ?>
<li>
<?= $subject ?>
<ul>
<?php foreach($results as $grade) { ?>
<li>
<?= $grade ?>
<li>
<?php } ?>
<ul>
<li>
<?php } ?>
</ul>
</body>
</html>