[HELP] PHP + DELPHI + COM

try {
	$obj = new COM("{20B9C5D8-CA47-4FEC-BD75-1D6E676E346D}"); // or die ( "Unable to instantiate the COM!"); 
	$result = $obj->RetornaOI( 1 ) ;	
	echo $result;
 
} catch (Exception $e) {
    echo 'Exception: ',  $e->getMessage(), "\n";
}

unit Project1_TLB;

{$TYPEDADDRESS OFF} // Unit must be compiled without type-checked pointers.
{$WARN SYMBOL_PLATFORM OFF}
{$WRITEABLECONST ON}
{$VARPROPSETTER ON}
{$ALIGN 4}

interface

uses Winapi.Windows, System.Classes, System.Variants, System.Win.StdVCL, Vcl.Graphics, Vcl.OleServer, Winapi.ActiveX;


// *********************************************************************//
// GUIDS declared in the TypeLibrary. Following prefixes are used:
//   Type Libraries     : LIBID_xxxx
//   CoClasses          : CLASS_xxxx
//   DISPInterfaces     : DIID_xxxx
//   Non-DISP interfaces: IID_xxxx
// *********************************************************************//
const
  // TypeLibrary Major and minor versions
  Project1MajorVersion = 1;
  Project1MinorVersion = 0;

  LIBID_Project1: TGUID = '{3F1A5D47-8E64-4266-B0C5-8D30A6A2F15E}';

  IID_ITesteOI: TGUID = '{A702E3FB-107E-4E8E-BFF2-539B7655D268}';
  CLASS_TesteOI: TGUID = '{20B9C5D8-CA47-4FEC-BD75-1D6E676E346D}';
type

// *********************************************************************//
// Forward declaration of types defined in TypeLibrary
// *********************************************************************//
  ITesteOI = interface;

// *********************************************************************//
// Declaration of CoClasses defined in Type Library
// (NOTE: Here we map each CoClass to its Default Interface)
// *********************************************************************//
  TesteOI = ITesteOI;


// *********************************************************************//
// Interface: ITesteOI
// Flags:     (256) OleAutomation
// GUID:      {A702E3FB-107E-4E8E-BFF2-539B7655D268}
// *********************************************************************//
  ITesteOI = interface(IUnknown)
    ['{A702E3FB-107E-4E8E-BFF2-539B7655D268}']
    function RetornaOI(Parametro: Integer): WideString; stdcall;
  end;

// *********************************************************************//
// The Class CoTesteOI provides a Create and CreateRemote method to
// create instances of the default interface ITesteOI exposed by
// the CoClass TesteOI. The functions are intended to be used by
// clients wishing to automate the CoClass objects exposed by the
// server of this typelibrary.
// *********************************************************************//
  CoTesteOI = class
    class function Create: ITesteOI;
    class function CreateRemote(const MachineName: string): ITesteOI;
  end;

implementation

uses System.Win.ComObj;

class function CoTesteOI.Create: ITesteOI;
begin
  Result := CreateComObject(CLASS_TesteOI) as ITesteOI;
end;

class function CoTesteOI.CreateRemote(const MachineName: string): ITesteOI;
begin
  Result := CreateRemoteComObject(MachineName, CLASS_TesteOI) as ITesteOI;
end;

end.