Note, of the rotate functions below, only beau's worked for me. Not sure if it is because of my source image, but upon rotating, the background became blue.
The code snippet below is what I used to prepare UPS shipping labels. The UPS xml api will return a base64 encoded gif, but it is sideways, so as to print on the top half of a 8.5x11 "letter" page. We are saving it in a database and sending it to a label printer, so needed it rotated...
The other code further down didn't make the background blue, however it did make the image leave the canvas by about 50%. Additionally, the imagecolorallocate() function has an example describing how to set the background color. That didn't work for me. Even though the blue BG is #0000ff, using that code didn't work, I had to use the transparent trick below.
The GD image functions may be in their infancy, however are a great reminder to me how powerful php is! Also, ubuntu apache users will need to apt-get install php5-gd to get the gd functions.
<?php
$image=imagecreatefromgif( 'data://text/plain;base64,'.$this->shipmentLabelGraphicImage );
$image=$this->rotateImage($image, 90); $blue = imagecolorallocate($image, 0, 0, 255);
imagecolortransparent($image, $blue); imagepng($image,$this->shipmentTrackingNumber.".png");
echo '<P><img src="'.$this->shipmentTrackingNumber.'.png"></P>';
imagedestroy($image);
?>
