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<?php
header ("Content-Type: image/png");
$markImage = imageCreateFromPNG('logo.png');
$srcImage = imageCreateFromPNG('back.png');
imagealphablending($srcImage, true);
//关键代码, 透明图片
$markW = imagesx($markImage);
$markH = imagesy($markImage);
imageCopy($srcImage, $markImage, 180, 30, 0, 0, $markW, $markH);
imageJpeg($srcImage); //output to browser
imagedestroy($srcImage);
imagedestroy($markImage);
?>