What are some common methods in PHP to overlay two images with transparent backgrounds?

When overlaying two images with transparent backgrounds in PHP, one common method is to use the GD library functions such as imagecreatefrompng() and imagecopy(). These functions allow you to load images with transparent backgrounds and copy one image onto another while preserving the transparency. 

// Load the base image with transparent background
$baseImage = imagecreatefrompng('base_image.png');

// Load the overlay image with transparent background
$overlayImage = imagecreatefrompng('overlay_image.png');

// Get the dimensions of the overlay image
$overlayWidth = imagesx($overlayImage);
$overlayHeight = imagesy($overlayImage);

// Copy the overlay image onto the base image at specific coordinates
imagecopy($baseImage, $overlayImage, 0, 0, 0, 0, $overlayWidth, $overlayHeight);

// Output the final image with the overlay
header('Content-Type: image/png');
imagepng($baseImage);

// Free up memory
imagedestroy($baseImage);
imagedestroy($overlayImage);

Keywords

imagecopymerge imagecreatefrompng imagealphablending imagecopy transparency

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