What is the purpose of using imageAlphaBlending and imageSaveAlpha functions in PHP when working with PNG images?

When working with PNG images in PHP, the imageAlphaBlending function is used to enable or disable the alpha blending mode for image transparency. The imageSaveAlpha function is used to save the full alpha channel information when saving a PNG image. These functions are important when you want to preserve the transparency of PNG images while working with them in PHP.

// Enable alpha blending for transparency
imageAlphaBlending($image, true);

// Save alpha channel information when saving PNG image
imageSaveAlpha($image, true);