creating new class from wrapper class (OOP question)

[Henrik Gemal <spam@xxxxxxxx>]

In a image gallery I have to class'es:

class GPicFilePicture extends GPicFileType
class GPicFileMovie extends GPicFileType

both of them are based on:

abstract class GPicFileType

In my code I need to create a new GPicFilePicture. To avoid duplicated
code I've create a wrapper class:

class GPicFile

that does something like this:

if (fileextension == "jpg")
  return new GPicFilePicture();
else
  return new GPicFileMovie();

so my PHP code looks like:
$file = new GPicFile($filename);

getFileDate() is implemented in both GPicFilePicture and GPicFileMovie.

Now I try to do:
$file->getFileDate();

I get an error saying:
Call to undefined method GPicFile::getFileDate()

Where am I going wrong?

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