no non funziona
posto l'intero codice dei due files

positions.php
codice:



<tbody id="developers">

<?php
$sql_query = "SELECT posnum,currency,pair,amount,cost,result,timeon,pricein FROM position ORDER BY id ASCLIMIT20";
$resultset = mysqli_query($conn, $sql_query) or die("database error:". mysqli_error($conn));
while( $developer = mysqli_fetch_assoc($resultset) ) {

    
    $price = $api->price($developer["currency"]."USDT");

    $res = (($price-$developer["pricein"])/$developer["pricein"]);
    if($res > 0) { $color = "<td style=\"width: 10.00%; color:#06C27C\">"; }else{ $color = "<td style=\"width: 10.00%; color:#CF2E58\">"; };


?>
        

            <tr>  
            <td style="width: 2.00%"><img border="0" alt="" src="./icons/32/white/<?php echo $developer["currency"]; ?>.PNG" width="22" height="22"></td>
            <td style="width: 12.00%"><?php echo $developer["currency"]; ?></td>
            <td style="width: 12.50%"><?php echo $developer["amount"]; ?></td>
            <td style="width: 12.50%"><?php echo $developer["cost"]; ?></td>
            <?php echo $color; ?><?php echo percent($res)?></td>
            <td style="width: 15.00%"><?php echo $developer["pricein"]; ?></td>
            <td style="width: 15.00%"><?php echo $price;?></td>
            <td style="width: 10.00%"><?php $now = date_create()->format('Y-m-d H:i:s');  $diff = abs(strtotime($now) - strtotime($developer["timeon"])); echo secondsToTime($diff);  ?></td>
            <td style="width: 18.00%">
            <button class="btn btn-primary btn-xs-info" data-toggle="modal" data-target="#exampleModal" data-id="<?php echo $developer["posnum"]; ?>">Info</button>  <button data-toggle="modal" data-target="#myModal" class="btn btn-primary btn-xs-sell" data-id="'.$row['ID'].'">Sell</button>
            

            
            
            
            </td>
            
            </tr>  
<?php  
};  
?> 


</td>


</tbody>
</table>
</div>

<script>
              
</script>


modal.php

codice:
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
     
      
<?php echo $developer["posnum"]; ?> <------------------------ la variabile deve comparire qui
      




      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>