<?php
 
$foo1 = new stdClass();
$foo2 = new stdClass();
$foo3 = new stdClass();
 
$foo1->one = "1";
$foo2->two = "2";
 
foreach ( $foo1 as $key => $value ) {
  $foo3->$key = $value;
}
 
foreach ( $foo2 as $key => $value ) {
  $foo3->$key = $value;
}
 
var_dump($foo3);