php水印代码，php半透明水印支持png透明背景

3. //原始图像

4. $dst = "/upload/20140914/20120914040740-0.jpg"; //图片路径

5. //原始图片信息

6. $dst_info = getimagesize($dst);
7. switch ($dst_info[2])
8. {
9. case 1:
10. $dst_im =imagecreatefromgif($dst);break;
11. case 2:
12. $dst_im =imagecreatefromjpeg($dst);break;
13. case 3:
14. $dst_im =imagecreatefrompng($dst);break;
15. case 6:
16. $dst_im =imagecreatefromwbmp($dst);break;
17. default:
18. die("不支持的文件类型1");exit;
19. }
20. //水印图像
21. $src = "/images/shuiyin.png"; //注意路径要写对
22. $src_info = getimagesize($src);
23. switch ($src_info[2])
24. {
25. case 1:
26. $src_im =imagecreatefromgif($src);break;
27. case 2:
28. $src_im =imagecreatefromjpeg($src);break;
29. case 3:
30. $src_im =imagecreatefrompng($src);break;
31. case 6:
32. $src_im =imagecreatefromwbmp($src);break;
33. default:
34. die("不支持的文件类型1");exit;
35. }
36. //半透明格式水印
37. //$alpha = 50; //水印透明度
38. //imagecopymerge($dst_im,$src_im,$dst_info[0]-$src_info[0]-10,$dst_info[1]-$src_info[1]-10,0,0,$src_info[0],$src_info[1],$alpha);
39. //支持png本身透明度的方式
40. imagecopy($dst_im,$src_im,$dst_info[0]-$src_info[0]-10,$dst_info[1]-$src_info[1]-10,0,0,$src_info[0],$src_info[1]);

41. //保存图片

42. switch ($dst_info[2]){
43. case 1:
44. imagegif($dst_im,$dst);break;
45. case 2:
46. imagejpeg($dst_im,$dst);break;
47. case 3:
48. imagepng($dst_im,$dst);break;
49. case 6:
50. imagewbmp($dst_im,$dst);break;
51. default:
52. die("不支持的文件类型2");exit;
53. }

54. //销毁gd库对象

55. imagedestroy($dst_im);
56. imagedestroy($src_im);

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