How can one ensure that the transparent part of a PNG overlay remains intact when overlaying it on a JPEG image in PHP?

When overlaying a PNG image with transparency on top of a JPEG image in PHP, the transparency can be lost if not handled correctly. To ensure that the transparent part of the PNG overlay remains intact, you can use the imagecopy() function along with imagealphablending() and imagesavealpha() functions to preserve the transparency. 

$jpegImage = imagecreatefromjpeg('background.jpg');
$pngOverlay = imagecreatefrompng('overlay.png');

imagealphablending($jpegImage, true);
imagesavealpha($jpegImage, true);

imagecopy($jpegImage, $pngOverlay, $x, $y, 0, 0, imagesx($pngOverlay), imagesy($pngOverlay));

header('Content-Type: image/jpeg');
imagejpeg($jpegImage);

imagedestroy($jpegImage);
imagedestroy($pngOverlay);

Keywords

PNG JPEG overlay transparency image manipulation

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