Description:
------------
This problem happens when a call a specific method from a class and when a i try a echo this values strange chars (+,*,),#) apear than the real data value. Here goes the sample script:

Reproduce code:
---------------
<?

class y
  {
  function x()
    {
    $query = "any insert";
    $resultado = mysql_query($query);
  
    $id = mysql_insert_id($this->Conexao);
    echo "<br>inside function ".$id; 
    }
  }

$z = new y();
$x = $z->x();

echo "<br>outside function".$x;

?>

Expected result:
----------------
inside function 12
outside function 12

Actual result:
--------------
inside function 12
outside function (

or 

inside function 12
outside function *

or 

inside function 12
outside function #