php透明合并png与jpg图片

源

 <?php
 $png = imagecreatefrompng('./mark.png');
 $jpeg = imagecreatefromjpeg('./image.jpg');

 list($width, $height) = getimagesize('./image.jpg');
 list($newwidth, $newheight) = getimagesize('./mark.png');
 $out = imagecreatetruecolor($newwidth, $newheight);
 imagecopyresampled($out, $jpeg, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
 imagecopyresampled($out, $png, 0, 0, 0, 0, $newwidth, $newheight, $newwidth, $newheight);
 imagejpeg($out, 'out.jpg', 100);
 ?>

 另外一种方法：

 $dest = imagecreatefrompng('mapCanvas.png');
 $src = imagecreatefromjpeg('si.jpg');
 imagealphablending($dest, false);
 imagesavealpha($dest, true);
 // Copy and merge
 imagecopymerge($dest, $src, 17, 13, 0, 0, 60, 100, 100);

 // Output and free from memory
 header('Content-Type: image/png');
 imagepng($dest);

 imagedestroy($dest);
 imagedestroy($src);