Using the imagesetstyle() Function
<?php
define("WIDTH", 200);
define("HEIGHT", 200);
$img = imagecreate(WIDTH, HEIGHT);
$background = $white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);
$black = imagecolorallocate($img, 0, 0, 0);
imagerectangle($img, 0, 0, WIDTH-1, HEIGHT-1, $black);
$dashed = array($black, $black, $black, $white, $white, $white);
$sos = array($black, $black,$white, $white,$white, $white,$white, $white);
imagesetstyle($img, $sos);
imageline($img, 0, 0, WIDTH-1, HEIGHT-1, IMG_COLOR_STYLED);
imageline($img, 0, HEIGHT-1, WIDTH-1, 0, IMG_COLOR_STYLED);
imagesetstyle($img, $dashed);
imagerectangle($img, 30, 30, WIDTH-31, HEIGHT-31, IMG_COLOR_STYLED);
imagerectangle($img, 50, 50, WIDTH-51, HEIGHT-51, $black);
header("Content-Type: image/png");
imagepng($img);
?>
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