[FIXED] How to flip part of an image horizontal with PHP GD

Issue

I am creating an image with parts from another image. I use imagecopy to but the "parts" togheter. Some parts need to be flipped horizontal.

For example this part:

imagecopy($output, $input, 0,8, 44,20, 4,12);

How do i flip this part horizontal??

I have tried this:

imagecopy($output, $input, (0 - 1),8, 44,20, 4,12);

But it does not work.

I have searched for ages, but cant find anything that works

My script looks like this:

$input = imagecreatefrompng($image_file);
$output = imagecreatetruecolor(50, 40);

imagecopy($output, $input, 4,8, 20,20, 8,14);
imagecopy($output, $input, 12,8, 44,20, 4,14);
imagecopy($output, $input, 4,20, 4,20, 4,14);
imagecopy($output, $input, 8,28, 4,20, 4,14);
imagecopy($output, $input, 32,8, 52,20, 4,14);
imagecopy($output, $input, 24,20, 12,20, 4,14);
imagecopy($output, $input, 28,28, 12,20, 4,14); 
imagecopy($output, $input, 4,0, 40,8, 8,9);
imagecopy($output, $input, 24,0, 56,8, 8,9);


header('Content-Type: image/png');

imagepng($output);

imagedestroy($output);
imagedestroy($input);

Solution

I want to share the answer some years later... :)

Change:

imagecopy($output, $input, 8, 20, 4, 20, 4, 12)

To:

imagecopyresampled($output, $input, 8, 20, (8 - 1), 20, 4, 12, 0 - 4, 12);

Which will flip the part of the image horizontal.

Answered By - 2by

Answer Checked By - Clifford M. (PHPFixing Volunteer)