PHP实现下载图片的通用方法

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

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下载图片, PHP