使锟斤拷 Alpha 通锟斤拷为图锟斤拷锟剿�
Example #1 使锟斤拷 Alpha 通锟斤拷为图锟斤拷锟剿�
<?php
// 锟斤拷锟斤拷水印锟皆硷拷要锟斤拷水印锟斤拷图锟斤拷
$stamp = imagecreatefrompng('stamp.png');
$im = imagecreatefromjpeg('photo.jpeg');
// 锟斤拷锟斤拷水印图锟斤拷锟斤拷锟竭距，锟斤拷锟揭伙拷取水印图锟斤拷某叽锟�
$marge_right = 10;
$marge_bottom = 10;
$sx = imagesx($stamp);
$sy = imagesy($stamp);
// 锟斤拷锟斤拷图锟斤拷目锟饺猴拷水印锟斤拷锟斤拷呔锟斤拷锟斤拷位锟矫ｏ拷锟斤拷锟揭斤拷水印锟斤拷锟狡碉拷图锟斤拷锟斤拷
imagecopy($im, $stamp, imagesx($im) - $sx - $marge_right, imagesy($im) - $sy - $marge_bottom, 0, 0, imagesx($stamp), imagesy($stamp));
// 锟斤拷锟酵硷拷锟斤拷头锟斤拷诖锟�
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
