Php - this code wont work with bootstrap style

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PHP

bootstrap

I have the following Bootstrap code

<li class="list-group-item">Pot na Roblek <span class="badge">2017-08-16</span> </li>

I works fine when trying to display it as is, but when i try to add it to a php script like this :

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
    echo '<li class=\"list-group-item\">'.$row["naslov"].'<span class=\"badge\">'.$row["datum"] .'</span></li>';
    }
} else {
    echo "0 rezultatov";
}

The code wont work and wont display the Bootstrap style and will instead display only a normal "list item"

What I have tried:

I have no idea what to try, but this other code works with Bootstrap:

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
            echo '<tr>';
            echo '<td class=\"success\">'.$row["datum"].'</td>';
            echo '<td class=\"success\">';
            echo '<a href="'.$row['link'].'">'.$row["naslov"].'</a>';
            echo '</td>';
            echo '</tr>';
    }
} else {
    echo "0 rezultatov";
}