COM object method undefined

I'm having troubles calling any method inside a COM class in php. In order to find all methods inside that class, I used:

$com = new COM('Some.Class.Name');
com_print_typeinfo($com);

Comes out this class contains some 100 different methods. But when calling any of them:

$com->SomeMethod();

,this error pops up:

Fatal error: Call to undefined method com::SomeMethod() in
C:\xampp\htdocs\www\test.php on line 22

This doesn't happen when I use other COM objects, like 'InternetExplorer.Application' class.
Also, I know this COM object works as expected with other programming languages like Delphi.

I'm using PHP 5.5.19, on 64-bit Windows Vista, and XAMPP, with 32-bit PHP architecture.

I would appreciate any lead on what may be going on or some possible workaround to this situation.

EDIT:
The COM server application is made with Delphi.

This might be another clue: When I use the code

$com = new COM('Some.Class.Name');
foreach ($com as $obj) { 
    echo $obj->Name . "<br />"; 
} 

I get:

Fatal error: Uncaught exception 'Exception' with message 'Object of
type com did not create an Iterator'

I guess this indicates there could be a problem with the application interface itself, but I don't know what that problem might be. I work in PHP, so the insides of COM objects are a total blur to me. But I would very much appreciate any clue on the concrete steps in order to fix this situation.

EDIT2:
This is the in short code from the Srv_TLB.pas file.

unit Srv_TLB;

{$TYPEDADDRESS OFF}
{$WARN SYMBOL_PLATFORM OFF}
{$WRITEABLECONST ON}
{$VARPROPSETTER ON}
interface

uses Windows, ActiveX, Classes, Graphics, StdVCL, Variants;

const
  // TypeLibrary Major and minor versions
  SrvMajorVersion = 1;
  SrvMinorVersion = 0;

  LIBID_Srv: TGUID = '{xxxxx-xxx-xxx-xx...}';

  IID_ISrvObject: TGUID = '{yyyyy-yyy-yyy-yy..}';
  CLASS_SrvObject: TGUID = '{zzzzz-zzz-zzz-z...}';
type

// *********************************************************************//
// Forward declaration of types defined in TypeLibrary                    
// *********************************************************************//
  ISrvObject = interface;
  ISrvObjectDisp = dispinterface;

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

  ISrvObject = interface(IDispatch)
    ['{yyyyy-yyy-yyy-yy..}']
    function FuncName1(const param1: WideString; const param2: WideString): Integer; safecall;
    function FuncName2: OleVariant; safecall;
    function FuncName3(const param: WideString): Integer; safecall;
  end;

    // *********************************************************************//
// DispIntf:  ISrvObjectDisp
// Flags:     (4416) Dual OleAutomation Dispatchable
// GUID:      {yyyyy-yyy-yyy-yy..}
// *********************************************************************//
  ISrvObjectDisp = dispinterface
    ['{yyyyy-yyy-yyy-yy..}']
    function FuncName1(const param1: WideString; const param2: WideString): Integer; dispid 3;
    function FuncName2: OleVariant; dispid 4;
    function FuncName3(const param: WideString): Integer; dispid 5;
  end;

    CoSrvObject = class
    class function Create: ISrvObject;
    class function CreateRemote(const MachineName: string): ISrvObject;
  end;

implementation

uses ComObj;

class function CoSrvObject.Create: ISrvObject;
begin
  Result := CreateComObject(CLASS_SrvObject) as ISrvObject;
end;

class function CoSrvObject.CreateRemote(const MachineName: string): ISrvObject;
begin
  Result := CreateRemoteComObject(MachineName, CLASS_SrvObject) as ISrvObject;
end;

end.

And the problem is (from the PHP side of things):
I can initialize the COM object with $com = new COM('The.Class.Name'); or with $com = new COM('{GUID}');, and I get the type info with com_print_typeinfo($com);, so I can see the object should have the methods FuncName1(), FuncName2() and FuncName3(), but when I try to call any of them with $com->FuncName1(param1, param2);, what it returns is this error:

Fatal error: Call to undefined method com::SomeMethod() in
C:\xampp\htdocs\www\test.php on line 22