How do i get a transparent background after rotaing a png image with php?

Question

So I have png image and I rotate it but i get a black background.. or if i do the color code ofr white i get white.. I tried doing this..

$trans = imagecol         


        

Answer 1

        // Turn off transparency blending (temporarily)
        imagealphablending($image, false);

        // Create a new transparent color for image
        $color = imagecolorallocatealpha($image, 0, 0, 0, 127);

        // Completely fill the background of the new image with allocated color.
        imagefill($image, 0, 0, $color);

        // Restore transparency blending
        imagesavealpha($image, true);