What is the purpose of the imagealphablending function in PHP when dealing with PNG files?

When dealing with PNG files in PHP, the imagealphablending function is used to enable or disable alpha blending for PNG images. Alpha blending allows for transparent areas in PNG images to be displayed correctly when overlaying them on top of other images or backgrounds. By setting alpha blending to true, the transparency of PNG images will be preserved when merging them with other images. 

// Enable alpha blending for PNG images
$image = imagecreatefrompng('image.png');
imagealphablending($image, true);

// Display or save the image as needed
header('Content-Type: image/png');
imagepng($image);

// Free up memory
imagedestroy($image);

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