php gd实现下载图片

代码转载于：

1. header("Content-type:text/html ; charset=utf-8");
3. if (!empty($_POST['submit'])){
4. $url = $_POST['url'];
5. $pictureName = $_POST['pictureName'];
6. $img = getPicture($url,$pictureName);
7. echo '
   ';
8. }
9. function getPicture($url,$pictureName){
10. if ($url == "") return false;
11. //获取图片的扩展名
12. $info = getimagesize($url);
13. $mime = $info['mime'];
14. $type = substr(strrchr($mime,'/'), 1);
15. //不同的图片类型选择不同的图片生成和保存函数
16. switch($type){
17. case 'jpeg':
18. $img_create_func = 'imagecreatefromjpeg';
19. $img_save_func = 'imagejpeg';
20. $new_img_ext = 'jpg';
21. break;
22. case 'png':
23. $img_create_func = 'imagecreatefrompng';
24. $img_save_func = 'imagepng';
25. $new_img_ext = 'png';
26. break;
27. case 'bmp':
28. $img_create_func = 'imagecreatefrombmp';
29. $img_save_func = 'imagebmp';
30. $new_img_ext = 'bmp';
31. break;
32. case 'gif':
33. $img_create_func = 'imagecreatefromgif';
34. $img_save_func = 'imagegif';
35. $new_img_ext = 'gif';
36. break;
37. case 'vnd.wap.wbmp':
38. $img_create_func = 'imagecreatefromwbmp';
39. $img_save_func = 'imagewbmp';
40. $new_img_ext = 'bmp';
41. break;
42. case 'xbm':
43. $img_create_func = 'imagecreatefromxbm';
44. $img_save_func = 'imagexbm';
45. $new_img_ext = 'xbm';
46. break;
47. default:
48. $img_create_func = 'imagecreatefromjpeg';
49. $img_save_func = 'imagejpeg';
50. $new_img_ext = 'jpg';
51. }
52. if ($pictureName == ""){
53. $pictureName = time().".{$new_img_ext}";
54. }else{
55. $pictureName = $pictureName.".{$new_img_ext}";
56. }
57. $src_im = $img_create_func($url); //由url创建新图片
58. $img_save_func($src_im, $pictureName); //输出文件到文件
59. return $pictureName;
60. }
62. ?>
63. 远程url地址：
    

    文件名称：

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