php缩略图代码，实现满窗格等比例缩小

2. /**
3. * 等比例缩小的缩略图
4. * edit bbs.it-home.org
5. */
6. function thumbs($FileName,$SaveTo,$SetW,$SetH){
7. $IMGInfo= getimagesize($FileName);
8. if(!$IMGInfo) return false;
9. if($IMGInfo[mime]== "image/pjpeg" || $IMGInfo[mime]=="image/jpeg"){
10. $ThisPhoto= imagecreatefromjpeg($FileName);
11. }elseif($IMGInfo[mime]== "image/x-png" || $IMGInfo[mime]== "image/png"){
12. $ThisPhoto= imagecreatefrompng($FileName);
13. }elseif($IMGInfo[mime]== "image/gif"){
14. $ThisPhoto=imagecreatefromgif($FileName);
15. }
16. $width=$IMGInfo[0];
17. $height=$IMGInfo[1];
18. $scalc = max($width/$SetW,$height/$SetH);
19. $nw = intval($width/$scalc);
20. $nh = intval($height/$scalc);
21. echo "缩略大小：w$nw,h$nh
    ";
22. if($SetW-$nw == 1){$nw = $SetW;}
23. if($SetH-$nh == 1){$nh = $SetH;}
24. echo "+修正1像素： w$nw,h$nh
    ";
25. //补宽
26. if($SetW-$nw > 0){
27. $nh = $nh +(($nh/$nw) * ($SetW-$nw));
28. echo "*需补宽".($SetW-$nw).",陪补高".(($nh/$nw) * ($SetW-$nw))."
    ";
29. $nw = $SetW;
30. }
31. //补高
32. if($SetH-$nh > 0){
33. $nw = $nw + (($nw/$nh) * ($SetH-$nh));
34. echo "*需补高".($SetH-$nh).",陪补宽". (($nw/$nh) * ($SetH-$nh)) ."
    ";
35. $nh = $SetH;
36. }
38. $nw = intval($nw);
39. $nh = intval($nh);
40. echo "+修正大小：w$nw,h$nh
    ";
41. $px = ($SetW - $nw)/2;
42. $py = ($SetH - $nh)/2;
43. echo "窗口大小：w$SetW,h$SetH
    ";
44. echo "+偏移修正：x$px,y$py
    ";
45. $NewPhoto=imagecreatetruecolor($SetW,$SetH);
46. imagecopyresized($NewPhoto,$ThisPhoto,$px,$py,0,0,$nw,$nh,$width,$height);
47. ImageJpeg ($NewPhoto,$SaveTo);
48. return true;
49. }
50. thumbs('a.jpg','newa.jpg',150,70);
51. ?>

2，css代码部

3，html页面中的图片地址