Bootstrap datatable- No data available out of an php array

Hello,

I use the following script:

<script>
  import { mdbDatatable2, mdbContainer } from 'mdbvue';
  export default {
    components: {
      mdbDatatable2,
      mdbContainer
    }
  };
</script>

And this is my table which I create out of an php array:

echo '<table id="dtBasicExample" class="table table-striped table-bordered table-sm" cellspacing="0" width="100%">';
echo '<tbody>';
echo '<thead>';
echo '<tr>';
echo '<th>';
echo "Charakterid";
echo '</th>';
echo '<th>';
echo "Serverid";
echo '</th>';
echo '<th>';
echo "Level";
echo '</th>';
echo '<th>';
echo "";
echo '</th>';
echo '</tr>';
echo '</thead>';
echo '<tr>';
echo '<td>';
echo $head['name'];       
echo '</td>';
echo '<td>';
echo $head['transmog']['item']['id'];   
echo '</td>';
echo '<td>';
echo $head['item']['id'];   
echo '</td>';
echo '</tr>';
echo '<tr>';
echo '<td>';
echo $neck['name'];       
echo '</td>';
echo '<td>';
echo $shoulder['transmog']['item']['id'];   
echo '</td>';
echo '<td>';
echo $neck['item']['id'];   
echo '</td>';
echo '</tr>';
echo '<td>';
echo $chest['name'];       
echo '</td>';
echo '<td>';
echo $chest['transmog']['item']['id'];   
echo '</td>';
echo '<td>';
echo $chest['item']['id'];   
echo '</td>';
echo '</tr>';
echo '</tbody>';
echo '</table>';
?>   

I get the tables data out of an extern API json array, which I decode in a php array:

function getSslPage4($url4, $userAgent4)
{
    $ch4 = curl_init($url4);

    curl_setopt($ch4, CURLOPT_USERAGENT, $userAgent4);
    curl_setopt($ch4, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch4, CURLOPT_HEADER, false);
    curl_setopt($ch4, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch4, CURLOPT_URL, $url4);
    curl_setopt($ch4, CURLOPT_REFERER, $url4);
    curl_setopt($ch4, CURLOPT_RETURNTRANSFER, TRUE);

    $result4 = curl_exec($ch4);
    curl_close($ch4);

    return json_decode($result4, true);
}

 $url4 = "https://eu.api.blizzard.com/profile/wow/character/xx/xxx/equipment? 
 namespace=profile-eu&locale=de_DE&access_token=$token";

 $array = getSslPage4($url4, $userAgent4);

After that I call the data out of the php array with a foreach loop and echo them out in my table.

$named_slots = [];
foreach ($array['equipped_items'] as $item) {


      $named_slots[$item['slot']['type']] = $item;

The problem is that the "Bootstrap table" shows

"No data available in table".

Since it isn´t a json array anymore I dont think that I need to use the API. How can I fix this in an easy way?