Print keys of mas with foreach to one string

[phpOops]

Print keys of mas with foreach to one string, please help..

This is print full mas :

      foreach($obj as $k1 => $FSobject)
      {echo "<tr>";
       foreach($FSobject as $key => $value)
         {
         echo "<td> $value </td>";
         }
      echo "</tr>";
      }

[dagon]

sorry this is as clear as mud.
what's the output you want?
what do you currently get?
what's $obj look like?