$jsonn = array();

while ($sonucc = $gelsinn->fetch(PDO::FETCH_ASSOC)):
    $jsonn[] = $sonucc;
endwhile;

echo '<ul>';


foreach ($jsonn as $row) {
    echo '<li>';
    foreach ($row as $key => $value) {
        echo '<strong>' . $key . ':</strong> ' . $value . '<br>';
    }
    echo '</li>';
}

echo '</ul>';

$jsonn = array();

while ($sonucc = $gelsinn->fetch(PDO::FETCH_ASSOC)):
    $jsonn[] = $sonucc;
endwhile;

echo '<table>';


echo '<tr>';
foreach ($jsonn[0] as $key => $value) {
    echo '<th>' . $key . '</th>';
}
echo '</tr>';


foreach ($jsonn as $row) {
    echo '<tr>';
    foreach ($row as $value) {
        echo '<td>' . $value . '</td>';
    }
    echo '</tr>';
}

echo '</table>';