如何使用 PHP 对上传的图片应用水印

Question

如何使用 PHP 为上传的图片添加水印？

示例链接：http://www.kitebeaches.com/kitesurf/uploadPicture/NIRVANA_Club_Village.html

Answer 1

以前在 SO：

• How can I add an image onto an image in PHP like a watermark?
• Can this watermark function be improve (PHP)?
• How to watermark GIF image with 24-bit PNG with transparency in PHP?
• How to edit and watermark animated gifs, preferably through php?

Answer 2

试试这个（改编自sitepoint）：

<?php  

header('content-type: image/jpeg');  
$yourimagefile = 'something.jpg' // the image you're wanting to watermark
$watermark = imagecreatefrompng('watermark.png');  // the watermark
$watermark_width = imagesx($watermark);  
$watermark_height = imagesy($watermark);  
$image = imagecreatetruecolor($watermark_width, $watermark_height);  
$image = imagecreatefromjpeg($yourimagefile);  
$size = getimagesize($yourimagefile);  
$dest_x = $size[0] - $watermark_width - 5;  
$dest_y = $size[1] - $watermark_height - 5;  
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 100);  
imagejpeg($image);  
imagedestroy($image);  
imagedestroy($watermark);