Checkbox selected

<?php
session_start();

$scelte = [
    'Scelta1',
    'Scelta2',
    'Scelta3',
    'Scelta4'
];
?>
<html>
    <head></head>
    <body>
        <form method="post">
            <?php foreach($scelte as $scelta):?>
            <?php $checked = isset($_SESSION['check']) && in_array($scelta, $_SESSION['check']) ? 'checked' : ''?>
            <input type="checkbox" name="check[]" value="<?php echo $scelta;?>" <?php echo $checked;?>> <?php echo $scelta;?>
            <?php endforeach;?>
            <input type="submit" name="ok" value="Fai la tua scelta" />
        </form>
        <?php
            if (isset ($_POST['ok']) && isset($_POST['check'])) {
                $_SESSION['check'] = $_POST['check'];
            }
        ?>
    </body>
</html>