Problem afficher les données sur html multiple

<select size="8" multiple="multiple" tabindex="1">
<?php
$id_agents="19#20#103#25";
$x=explode("#",$id_agents);


$sql='select * from TABLE';
if ($result=mysqli_query($connect,$sql))
{
 $i=0;
 while($row = mysqli_fetch_assoc($result))
 {
 ?>
 <option value="<?php print $row['id_table_agents'];?>" <?php ($row['id_agents']==$x[$i])? print 'selected="selected"':'';?>><?php print $row['nom_agent'];?></option>
 <?php
 $i+=1;
 }
}

?>
</select>