How can PHP be used to overlay one image on top of another to create a composite image?

To overlay one image on top of another in PHP to create a composite image, you can use the GD library functions provided by PHP. First, load both images using `imagecreatefrompng()` or `imagecreatefromjpeg()` depending on the image format. Then, use functions like `imagecopy()` or `imagecopymerge()` to overlay one image onto the other at the desired position. Finally, save the resulting composite image using `imagepng()` or `imagejpeg()`. 

// Load the main image and overlay image
$mainImage = imagecreatefrompng('main_image.png');
$overlayImage = imagecreatefrompng('overlay_image.png');

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

// Overlay the image at position (x, y) on the main image
$x = 100; // Example position
$y = 50; // Example position
imagecopy($mainImage, $overlayImage, $x, $y, 0, 0, $overlayWidth, $overlayHeight);

// Save the resulting composite image
imagepng($mainImage, 'composite_image.png');

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

Keywords

PHP image manipulation GD library composite image overlay image

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