php - Add 3 <td> inside every <tr> loop

I am retrieving data from the DB and want to fill a table with 3<td></td> per<tr></tr> Here's what I have:

foreach($extras AS $key => $extra){
                                if($key % 3 == 0){
                                    echo "<tr>";
                                }
                                echo "<td>
                                    <input type='checkbox' data-price='$extra->precio' value='$extra->id' name='extras[]' id='extra-$extra->id' />". $key . " 
                                        <label for='extra-$extra->id'>
                                            <img class='mx-auto d-block' src='" . $this->config->item('base_url') . "assets/" . $extra->extra_uri . "' alt='$extra->nombre' />
                                            <p class='kit text-center'>$extra->nombre</p>
                                        </label></td>
                                ";
                                if($key % 3 != 0){
                                    echo "</tr>";
                                }
                            }
Copy code

It gives me a weird table, however if I do it with$key % 2 then it gives me a good table with 2 td's inside, for whatever reason, I just can't make it work with 3.

I looked at: PHP: How do you determine every Nth iteration of a loop? but that's pretty much what I've done to no avail.

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