More elegant way to check 3 conditions in php?

I have got 3 tennis courts which you can reserve. Now I need to check which court is reserved. This is very messy in php. I need to check:

Is court 1 reserved? If yes is court 2 reserved? If yes is court 3 reserved?... You get the point

Here is my code:

if($counter != 0){
            if($counter2 != 0){
            if($counter3 != 0){
            //Alle Plätze besetzt
            ?>
            <td>"R"</td>
            <td>"R"</td>
            <td class="td-border-right">"R"</td>
            <?php
            }else{
            //PLatz 1 u 2 besetzt, 3 nicht
            ?>
            <td>"R"</td>
            <td>"R"</td>
            <td class="td-border-right"></td>
            <?php
            }
            }
            else if($counter3 != 0){
            //PLatz 1 u 3besetzt, 2 nicht besetzt
            ?>
            <td>"R"</td>
            <td></td>
            <td class="td-border-right">"R"</td>
            <?php
            }else{
            ?>
            <td>"R"</td>
            <td>"R"</td>
            <td> class="td-border-right"></td>
            <?php
            }
            }else {
            if($counter2 != 0){
            if($counter3 != 0){
            ?>
            <td></td>
            <td>"R"</td>
            <td class="td-border-right">"R"</td>
            <?php
            }
            else{
            ?>
            <td></td>
            <td>"R"</td>
            <td class="td-border-right"></td>
            <?php
            }
            }else{
            if($counter3 != 0){
            ?>
            <td></td>
            <td></td>
            <td class="td-border-right">"R"</td>
            <?php
            }else{
            ?>
            <td></td>
            <td></td>
            <td class="td-border-right"></td>
            <?php
            }
            }
            }
?>

counter 1,2 and 3 are just placeholders for the moment.