OrbitStruct

struct MyStruct {
    short shortvalue;
    string stringvalue;
};

interface SomeInterface {
  void SetValues (MyStruct values);
  MyStruct GetValues();
}

<?php
$obj = new OrbitObject ($ior);

$initial_values = new OrbitStruct ("IDL:MyStruct:1.0");
$initial_values->shortvalue = 42;
$initial_values->stringvalue = "HGTTG";

$obj->SetValues ($initial_values);

$values = $obj->GetValues();

echo $values->shortvalue;
echo $values->stringvalue;
?>