PHP - Drawing Rectangle

<?php
  $s = new SWFShape();
  $s->setLine(14, 0x7f, 0xf0, 0);
  $s->setRightFill($s->addFill(0xff, 0, 0xaf));
  $s->movePenTo(100, 100);
  $s->drawLineTo(300, 100);
  $s->drawLineTo(300, 300);
  $s->drawLineTo(100, 300);
  $s->drawLineTo(100, 100);
  

  $m = new SWFMovie();
  $m->setDimension(400, 400);
  $m->setRate(1.0);
  $m->add($s);
  $m->nextFrame();

  header('Content-type: application/x-shockwave-flash');
  $m->output();
?>

PHP - Drawing Rectangle