<?php
  $ekyazar=mysql_query( "SELECT * FROM makaleyazar WHERE makale ='$makale->id' ORDER BY sira ASC ");
while($ekyaz=mysql_fetch_object($ekyazar)){
  $adlar[] = $ekyaz->adi;
   }
  $adlar = implode(", ",$adlar);
  echo $adlar; // Ad1, Ad2, Ad3
  ?>