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

This is what I am using, this work great for .png files with transparent backgrounds. High fives!

function rotate($degrees) {

    // Switch from default counter-clockwise to clockwise
    $degrees = 360 - $degrees; 

    // Get the image 
    $source =  imagecreatefrompng("images/image.png");

    // Rotate the image
    $rotated_image = imagerotate($source, $degrees, imageColorAllocateAlpha($source, 0, 0, 0, 127));

    // Save the rotated image
    imagepng($rotated_image, 'images/rotated_image.png');

}