<?php
$conn1 = new mysqli("localhost", "my_user", "my_password", "world");

/* проверка соединения */
if ($mysqli->connect_errno) {
    printf("Не удалось подключиться: %s\n", $conn1->connect_error);
    exit();
}

$set="1";

$query1 = "SELECT * FROM table1 WHERE group = ".$set." ";

$result = $conn1->query($query1);
while($row2 = mysqli_fetch_assoc($result))
{
$arr2[]=$row2;
}

$row=count($arr2);

echo '<table border="1">';
for ($tr=0; $tr<$row; $tr++){
echo'<tr>';
echo '<td>'.$arr2[$tr]["id"].'<td>'.$arr2[$tr]["group"].'<td>'.$arr2[$tr]["position"].'<td>'.$arr2[$tr]["text"].'</td>';

echo '</tr>';
}
echo '</table>';
?>