What is the function in PHP to copy one image onto another with a specified opacity?

To copy one image onto another with a specified opacity in PHP, you can use the imagecopymerge() function. This function takes the source and destination images, the coordinates where the source image should be placed on the destination image, and the opacity level. The opacity level ranges from 0 to 100, where 0 is completely transparent and 100 is completely opaque. 

$source = imagecreatefrompng('source.png');
$destination = imagecreatefrompng('destination.png');

// Get the width and height of the source image
$source_width = imagesx($source);
$source_height = imagesy($source);

// Copy the source image onto the destination image with 50% opacity
imagecopymerge($destination, $source, 0, 0, 0, 0, $source_width, $source_height, 50);

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

// Free up memory
imagedestroy($source);
imagedestroy($destination);

Keywords

PHP imagecopymerge opacity image manipulation GD Library

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