php上传图片并生成缩位图代码,我们时常要上传图片,但也要保留自己的版权所以就会用到图片加水印哦,下面的程序就是上传图片成功后再给图片加上你自己做的水印效果,实例代码如下:

1. <?php
2. class Image {
3. var $imageResource = NULL;
4. var $target = NULL;
5. var $enableTypes = array();
6. var $imageInfo = array();
7. var $createFunc = '';
8. var $imageType = NULL;
9. /**
10. * Construct for this class
11. *
12. * @param string $image
13. * @return Image
14. */
15. function Image($image = NULL) {
16. //get enables
17. if(imagetypes() & IMG_GIF) {
18. $this->enableTypes[] = 'image/gif';
19. }
20. if(imagetypes() & IMG_JPEG) {
21. $this->enableTypes[] = 'image/jpeg';
22. }
23. if (imagetypes() & IMG_JPG) {
24. $this->enableTypes[] = 'image/jpg';
25. }
26. if(imagetypes() & IMG_PNG) {
27. $this->enableTypes[] = 'image/png';
28. }
29. //end get
30. if($image != NULL) {
31. $this->setImage($image);
32. }
33. }
34. /**
35. * set a image resource
36. *
37. * @param string $image
38. * @return boolean
39. */
40. function setImage($image) {
41. if(file_exists($image) && is_file($image)) {
42. $this->imageInfo = getimagesize($image);
43. $img_mime = strtolower($this->imageInfo['mime']);
44. if(!in_array($img_mime, $this->enableTypes)) {
45. exit('系统不能操作这种图片类型.');
46. }
47. switch ($img_mime) {
48. case 'image/gif':
49. $link = imagecreatefromgif($image);
50. $this->createFunc = 'imagegif';
51. $this->imageType = 'gif';
52. break;
53. case 'image/jpeg':
54. case 'image/jpg':
55. $link = imagecreatefromjpeg($image);
56. $this->createFunc = 'imagejpeg';
57. $this->imageType = 'jpeg';
58. break;
59. case 'image/png':
60. $link = imagecreatefrompng($image);
61. $this->createFunc = 'imagepng';
62. $this->imageType = 'png';
63. break;
64. default:
65. $link = 'unknow';
66. $this->imageType = 'unknow';
67. break;
68. }
69. if($link !== 'unknow') {
70. $this->imageResource = $link;
71. } else {
72. exit('这种图片类型不能改变尺寸.');
73. }
74. unset($link);
75. return true;
76. } else {
77. return false;
78. }
79. }
80. /**
81. * set header
82. *
83. */
84. function setHeader() {
85. switch ($this->imageType) {
86. case 'gif':
87. header('content-type:image/gif');
88. break;
89. case 'jpeg':
90. header('content-type:image/jpeg');
91. break;
92. case 'png':
93. header('content-type:image/png');
94. break;
95. default:
96. exit('Can not set header.');
97. break;
98. }
99. return true;
100. }//开源代码phpfensi.com
101. /**
102. * change the image size
103. *
104. * @param int $width
105. * @param int $height
106. * @return boolean
107. */
108. function changeSize($width, $height = -1) {
109. if(!is_resource($this->imageResource)) {
110. exit('不能改变图片的尺寸,可能是你没有设置图片来源.');
111. }
112. $s_width = $this->imageInfo[0];
113. $s_height = $this->imageInfo[1];
114. $width = intval($width);
115. $height = intval($height);
116. if($width <= 0) exit('图片宽度必须大于零.');
117. if($height <= 0) {
118. $height = ($s_height / $s_width) * $width;
119. }
120. $this->target = imagecreatetruecolor($width, $height);
121. if(@imagecopyresized($this->target, $this->imageResource, 0, 0, 0, 0, $width, $height, $s_width, $s_height))
122. return true;
123. else
124. return false;
125. }
126. /**
127. * Add watermark
128. *
129. * @param string $image
130. * @param int $app
131. */
132. function addWatermark($image, $app = 50) {
133. if(file_exists($image) && is_file($image)) {
134. $s_info = getimagesize($image);
135. } else {
136. exit($image . '文件不存在.');
137. }
138. $r_width = $s_info[0];
139. $r_height = $s_info[1];
140. if($r_width > $this->imageInfo[0]) exit('水印图片必须小于目标图片');
141. if($r_height > $this->imageInfo[1]) exit('水印图片必须小于目标图片');
142. switch ($s_info['mime']) {
143. case 'image/gif':
144. $resource = imagecreatefromgif($image);
145. break;
146. case 'image/jpeg':
147. case 'image/jpg':
148. $resource = imagecreatefromjpeg($image);
149. break;
150. case 'image/png':
151. $resource = imagecreatefrompng($image);
152. break;
153. default:
154. exit($s_info['mime'] .'类型不能作为水印来源.');
155. break;
156. }
157. $this->target = &$this->imageResource;
158. imagecopymerge($this->target, $resource, $this->imageInfo[0] - $r_width - 5, $this->imageInfo[1] - $r_height - 5, 0,0 ,$r_width, $r_height, $app);
159. imagedestroy($resource);
160. unset($resource);
161. }
162. /**
163. * create image
164. *
165. * @param string $name
166. * @return boolean
167. */
168. function create($name = NULL) {
169. $function = $this->createFunc;
170. if($this->target != NULL && is_resource($this->target)) {
171. if($name != NULL) {
172. $function($this->target, $name);
173. } else {
174. $function($this->target);
175. }
176. return true;
177. } else if($this->imageResource != NULL && is_resource($this->imageResource)) {
178. if($name != NULL) {
179. $function($this->imageResource, $name);
180. } else {
181. $function($this->imageResource);
182. }
183. return true;
184. } else {
185. exit('不能创建图片,原因可能是没有设置图片来源.');
186. }
187. }
188. /**
189. * free resource
190. *
191. */
192. function free() {
193. if(is_resource($this->imageResource)) {
194. @imagedestroy($this->imageResource);
195. }
196. if(is_resource($this->target)) {
197. @imagedestroy($this->target);
198. }
199. }
200. }
201. ?>