<?
class Test{};
$some_object = new Test();
myprintr($some_object);

function myprintr(){
  $args = func_get_args();
  $id = spl_object_hash($args[0]);
  foreach($GLOBALS as $name => $value)
  {
     if (is_object($value) && spl_object_hash($value) == $id) echo $name;
  }
}

?>

some_object