No.
You have to enable the overload extension (it is enabled by default though).

You are probably confusing overloaded properties with public properties.

<?php
class obj {
 var $overloaded = array("name" => "My name");
 function __get($prop, &$retval) {
  if(isset($this->overloaded[$prop])) {
   $retval = $this->overloaded[$prop];
   return true;
  }
  return false;
 }
}

$obj = new obj;
/* This will print NULL since there is no "name" property */
var_dump($obj->name);

overload("obj");
$obj = new obj;
/* This will however print "My name" */
var_dump($obj->name); //

?>