What is the issue with the transparency of the PNG image in the provided PHP code?

The issue with the transparency of the PNG image in the provided PHP code is that the transparency is not being preserved when the image is saved. To solve this issue, you can use the `imagepng()` function with the `PNG_ALL_FILTERS` flag to preserve the alpha channel transparency of the image. 

// Load the PNG image
$image = imagecreatefrompng('input.png');

// Save the PNG image with transparency preserved
imagepng($image, 'output.png', 9, PNG_ALL_FILTERS);

// Free up memory
imagedestroy($image);

Keywords

PNG image transparency PHP code image processing GD library

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