PHP 8: problemi di Warning fastidiosi

[filippo.toso]

Questo codice con PHP 7.4 e PHP 8.0 a me funziona.

class Sol
{
    function blurb_html($string)
    {
        return $string;
    }
}
 
$sol = new Sol();
 
?>
<table border="0" cellspacing="0" cellpadding="0">
    <tr>
        <td style="width:60px">Titolo</td>
        <td><input type="text" name="tit1_1" value="<? echo $sol->blurb_html($strillo1[0] ?? ''); ?>" style="width:200px"></td>
    </tr>
    <tr>
        <td>Titolino</td>
        <td><input type="text" name="tit1_2" value="<? echo $sol->blurb_html($strillo1[1] ?? ''); ?>" style="width:200px"></td>
    </tr>
    <tr>
        <td>pagina</td>
        <td><input type="text" name="tit1_3" value="<? echo $sol->blurb_html($strillo1[2] ?? ''); ?>" style="width:200px"></td>
    </tr>
    <tr>
        <td>URL</td>
        <td><input type="text" name="tit1_4" value="<? echo $sol->blurb_html($strillo1[3] ?? ''); ?>" style="width:200px"></td>
    </tr>
</table>