Description:
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I want to put some worked codes into a function, in order to make my main script shorter.
All other MING classes work well,such as SWFSprite,SWFShape, except SWFBitmap.
I can get the error message from apache2:
 PHP Fatal error:  output() [<a href='function.output'>function.output</a>]: Initial Jpeg marker not found! 

It seems that the SWFBitmap object can not be returned in a function.

I tried test like this:
CODE I  + CODE III             :FAILED
CODE II + CODE IV              :WORKS
CODE I  + CODE II  + CODE III  : WORKS

Reproduce code:
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function get_b()//CODE I
{
   $mfile="xx.jpg";   $fp=fopen($mfile,"r");
   $string=fread($fp,filesize($mfile));
   $b = new SWFBitmap($string);
   fclose($fp);
   return $b;
}
   $mfile="xx.jpg";   $fp=fopen($mfile,"r");//CODE II
   $string=fread($fp,filesize($mfile));
   $b = new SWFBitmap($string);
   fclose($fp);

   $s = new SWFShape();

   $scale= $s->addFill(get_b());         //CODE III
   $scale= $s->addFill($b);              //CODE IV

Expected result:
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Can I put the code with the SWFBitmap object into a function?