php生成缩略图代码

1. /**********************
2. *@filename - path to the image
3. *@tmpname - temporary path to thumbnail
4. *@xmax - max width
5. *@ymax - max height
6. */
7. function resize_image($filename, $tmpname, $xmax, $ymax)
8. {
9. $ext = explode(".", $filename);
10. $ext = $ext[count($ext)-1];
12. if($ext == "jpg" || $ext == "jpeg")
13. $im = imagecreatefromjpeg($tmpname);
14. elseif($ext == "png")
15. $im = imagecreatefrompng($tmpname);
16. elseif($ext == "gif")
17. $im = imagecreatefromgif($tmpname);
19. $x = imagesx($im);
20. $y = imagesy($im);
22. if($x return $im;
24. if($x >= $y) {
25. $newx = $xmax;
26. $newy = $newx * $y / $x;
27. }
28. else {
29. $newy = $ymax;
30. $newx = $x / $y * $newy;
31. }
33. $im2 = imagecreatetruecolor($newx, $newy);
34. imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y);
35. return $im2;
36. }

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