phpGD库生成缩略图_PHP教程

3. header("content-type:text/html;charset=gbk");
4. ini_set("date.timezone","Asia/chong");
5. //判断文件是否为空
6. if(empty($_FILES)){
7. echo"上传文件过大";
8. exit;
9. }
10. //判断文件上传是否有错误
11. if($_FILES['pic']['error']){
12. echo "上传文件";
13. exit;
14. }
15. //判断文件类型是否非法获取文件后缀
16. $allowtype=array("jpg","png","jpeg","gif");
17. $a=explode('.',$_FILES['pic']['name']);
18. $index=count($a)-1;
19. $ex=strtolower($a[$index]);
20. if(!in_array($ex,$allowtype)){
21. echo "上传文件非法";
22. exit;
23. }
24. $file=date('YmdHis').rand().".".$ex;
25. $src=$_FILES['pic']['tmp_name'];
26. $des="upload/".$file;
27. $rs=move_uploaded_file($src,$des);
29. //缩略图
30. //读取已经上传图片
31. $image=imagecreatefromjpeg($des);
32. $a=getimagesize($des);
33. $w=$a[0];
34. $h=$a[1];
35. if($w>$h){
36. $width=300;
37. $height=$width/$w*$h;
38. }else if($w<$h){
39. $height=300;
40. $width=$height/$h*$w;
41. }else{
42. $width=300;
43. $height=300;
44. } www.jbxue.com
45. //创建空白新图片
46. $newimage=imagecreatetruecolor($width, $height);
47. //copy源图片内容 copy新图片
48. imagecopyresized($newimage, $image, 0,0, 0,0, $width, $height, $w, $h);
49. $filename="upload/s_".$file;
50. imagejpeg($newimage,$filename);

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