这款php生成图片与验证码图片生成原理代码,是由php gd库来支持,如果你的系统不能创建图片就把gd.dll前面的;去再,重起apache,如果是iis重起iis就OK了.创建图片后记得用ImageDestroy 清空内存.

php生成图片与验证码图片实例代码如下:

1. $w?$RESIZEWIDTH=$w:$RESIZEWIDTH=400;// 生成图片的宽度
2. $h?$RESIZEHEIGHT=$h:$RESIZEHEIGHT=400;// 生成图片的高度
3. function ResizeImage($im,$maxwidth,$maxheight,$name){
4. $width = imagesx($im);
5. $height = imagesy($im);
6. if(($maxwidth && $width > $maxwidth) || ($maxheight && $height > $maxheight)){
7. if($maxwidth && $width > $maxwidth){
8. $widthratio = $maxwidth/$width;
9. $RESIZEWIDTH=true;//www.phpfensi.com
10. }
11. if($maxheight && $height > $maxheight){
12. $heightratio = $maxheight/$height;
13. $RESIZEHEIGHT=true;
14. }
15. if($RESIZEWIDTH && $RESIZEHEIGHT){
16. if($widthratio < $heightratio){
17. $ratio = $widthratio;
18. }else{
19. $ratio = $heightratio;
20. }
21. }elseif($RESIZEWIDTH){
22. $ratio = $widthratio;
23. }elseif($RESIZEHEIGHT){
24. $ratio = $heightratio;
25. }
26. $newwidth = $width * $ratio;
27. $newheight = $height * $ratio;
28. if(function_exists("imagecopyresampled")){
29. $newim = imagecreatetruecolor($newwidth, $newheight);
30. imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
31. }else{
32. $newim = imagecreate($newwidth, $newheight);
33. imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
34. }
35. ImageJpeg ($newim,$name);
36. ImageDestroy ($newim);
37. }else{
38. ImageJpeg ($im,$name);
39. }
40. }
41. if($_FILES['uploadfile']['size']){
42. if($_FILES['uploadfile']['type'] == "image/pjpeg"){
43. $im = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']);
44. }elseif($_FILES['uploadfile']['type'] == "image/x-png"){
45. $im = imagecreatefrompng($_FILES['uploadfile']['tmp_name']);
46. }elseif($_FILES['uploadfile']['type'] == "image/gif"){
47. $im = imagecreatefromgif($_FILES['uploadfile']['tmp_name']);
48. }
49. if($im){
50. if(file_exists('bbs.jpg')){
51. unlink('www.phpfensi.com.jpg');
52. }
53. ResizeImage($im,$RESIZEWIDTH,$RESIZEHEIGHT,'bbs.jpg');
54. ImageDestroy ($im);
55. }
56. }
57. //$uploadfile="bbs.jpg";