一直想在网上找个图片所略图程序,但是一直没有找到无变形的,一般都是对原图进行简单的缩放,我想也许已经有了,只是我没有找到,所以没办法自己写了一个,其实也不是全是自己写的,只是在已有的基础上改的.

版权说明:该版本是在“IEB_UPLOAD CLASS Ver 1.1”的基础上二次开发的,原程序对图片的裁剪将使图片变形、失真！本人在该程序的基础上进行了更改,用数据参数与原图片文件参数(主要是指宽和高)进行对比,得出比例值,先生成与原图片同比例缩放的图片,然后再以该中间图中心开始截取,从而获得缩略图,当然,图片会被裁剪,但是是最小限度的裁剪.

$upfos = new ieb_upload('photo_file','./up_img'); photo_file 表单文件域名称，不要加$； ./up_img，上传位置

$old_file_name=$upfos -> getName();

$old_file_fooder=$upfos -> getExt();

$file_size=$upfos -> getSize();

$file_name=$upfos -> newName();

$upfos -> upload($file_name);

$upfos -> thumb("small_",125,120);

$new_file_name=$upfos -> UpFile(); $new_file_name 上传后大图名

$small_file_name="small_".$new_file_name; $small_file_name 略图名

php缩略图生成程序源码如下:

1. <?php
2. //程序设计:swin.wang Email: php_in_china@yahoo.com.cn QQ:592298893
3. //该程序你可无限制使用,但请保留版权信息.
4. class ieb_upload{
5. var $FormName; //文件域名称
6. var $Directroy; //上传至目录
7. var $MaxSize; //最大上传大小
8. var $CanUpload; //是否可以上传
9. var $doUpFile; //上传的文件名
10. var $sm_File; //缩略图名称
11. var $Error; //错误参数
12. function ieb_upload($formName='', $dirPath='', $maxSize=2097152) //(1024*2)*1024=2097152 就是 2M
13. {
14. global $FormName, $Directroy, $MaxSize, $CanUpload, $Error, $doUpFile, $sm_File;
15. //初始化各种参数
16. $FormName = $formName;
17. $MaxSize = $maxSize;
18. $CanUpload = true;
19. $doUpFile = '';
20. $sm_File = '';
21. $Error = 0;
22. if ($formName == ''){
23. $CanUpload = false;
24. $Error = 1;
25. break;
26. }
27. if ($dirPath == ''){
28. $Directroy = $dirPath;
29. }else{
30. $Directroy = $dirPath.'/';
31. }
32. }
33. //检查文件是否存在
34. function scanFile()
35. {
36. global $FormName, $Error, $CanUpload;
37. if ($CanUpload){
38. $scan = is_readable($_FILES[$FormName]['name']);
39. if ($scan){
40. $Error = 2;
41. }
42. return $scan;
43. }
44. }
45. //获取文件大小
46. function getSize($format = 'B')
47. {
48. global $FormName, $Error, $CanUpload;
49. if ($CanUpload){
50. if ($_FILES[$FormName]['size'] == 0){
51. $Error = 3;
52. $CanUpload = false;
53. }
54. switch ($format){
55. case 'B':
56. return $_FILES[$FormName]['size'];
57. break;
58. case 'M':
59. return ($_FILES[$FormName]['size'])/(1024*1024);
60. }
61. }
62. }
63. //获取文件类型
64. function getExt()
65. {
66. global $FormName, $Error, $CanUpload;
67. if ($CanUpload){
68. $ext=$_FILES[$FormName]['name'];
69. $extStr=explode('.',$ext);
70. $count=count($extStr)-1;
71. }
72. return $extStr[$count];
73. }
74. //获取文件名称
75. function getName()
76. {
77. global $FormName, $CanUpload;
78. if ($CanUpload){
79. return $_FILES[$FormName]['name'];
80. }
81. }
82. //新建文件名
83. function newName()
84. {
85. global $CanUpload, $FormName;
86. if ($CanUpload){
87. $FullName=$_FILES[$FormName]['name'];
88. $extStr=explode('.',$FullName);
89. $count=count($extStr)-1;
90. $ext = $extStr[$count];
91. return date('YmdHis').rand(0,9).'.'.$ext;
92. }
93. }
94. //上传文件
95. function upload($fileName = '')
96. {
97. global $FormName, $Directroy, $CanUpload, $Error, $doUpFile;
98. if ($CanUpload){
99. if ($_FILES[$FormName]['size'] == 0){
100. $Error = 3;
101. $CanUpload = false;
102. return $Error;
103. break;
104. }
105. }
106. if($CanUpload){
107. if ($fileName == ''){
108. $fileName = $_FILES[$FormName]['name'];
109. }
110. $doUpload=@copy($_FILES[$FormName]['tmp_name'], $Directroy.$fileName);
111. if($doUpload)
112. {
113. $doUpFile = $fileName;
114. chmod($Directroy.$fileName, 0777);
115. return true;
116. }else{
117. $Error = 4;
118. return $Error;
119. }
120. }
121. }
122. //创建图片缩略图
123. function thumb($dscChar='',$width=160,$height=120)
124. {
125. global $CanUpload, $Error, $Directroy, $doUpFile, $sm_File;
126. if ($CanUpload && $doUpFile != ''){
127. $srcFile = $doUpFile;
128. if ($dscChar == ''){
129. $dscChar = 'sm_';
130. }
131. $dscFile = $Directroy.$dscChar.$srcFile;
132. $data = getimagesize($Directroy.$srcFile,&$info);
133. switch ($data[2]) {
134. case 1:
135. $im = @imagecreatefromgif($Directroy.$srcFile);
136. break;
137. case 2:
138. $im = @imagecreatefromjpeg($Directroy.$srcFile);
139. break;
140. case 3:
141. $im = @imagecreatefrompng($Directroy.$srcFile);
142. break;
143. }
144. $srcW=imagesx($im);
145. $srcH=imagesy($im);
146. if(($srcW/$width)>=($srcH/$height)){
147. $temp_height=$height;
148. $temp_width=$srcW/($srcH/$height);
149. $src_X=abs(($width-$temp_width)/2);
150. $src_Y=0;
151. }
152. else{
153. $temp_width=$width;
154. $temp_height=$srcH/($srcW/$width);
155. $src_X=0;
156. $src_Y=abs(($height-$temp_height)/2);
157. }
158. $temp_img=imagecreatetruecolor($temp_width,$temp_height);
159. imagecopyresized($temp_img,$im,0,0,0,0,$temp_width,$temp_height,$srcW,$srcH);
160. $ni=imagecreatetruecolor($width,$height);
161. imagecopyresized($ni,$temp_img,0,0,$src_X,$src_Y,$width,$height,$width,$height);
162. $cr = imagejpeg($ni,$dscFile);
163. chmod($dscFile, 0777);
164. if ($cr){
165. $sm_File = $dscFile;
166. return true;
167. }else{
168. $Error = 5;
169. return $Error;
170. }
171. }
172. }
173. //显示错误参数
174. function Err(){
175. global $Error;
176. return $Error;
177. }
178. //上传后的文件名
179. function UpFile(){
180. global $doUpFile, $Error;
181. if ($doUpFile != ''){
182. return $doUpFile;
183. }else{
184. $Error = 6;
185. }
186. }
187. //上传文件的路径
188. function filePath(){
189. global $Directroy, $doUpFile, $Error;
190. if ($doUpFile != ''){
191. return $Directroy.$doUpFile;
192. }else{
193. $Error = 6;
194. }
195. }
196. //缩略图文件名称
197. function thumbMap(){
198. global $sm_File, $Error;
199. if ($sm_File != ''){
200. return $sm_File;
201. }else{
202. $Error = 6;
203. }
204. }
205. //开源代码phpfensi.com
206. //显示版本信息
207. function ieb_version(){
208. return 'swin img class Ver 0.1';
209. }
210. }
211. ?>