PHP 图片上传并生成缩略图类

1. /**
2. * 上传图片
3. */
4. class imgUpload{
5. static protected $a;
6. protected $formName; //表单名称
7. protected $directory; //文件上传至目录
8. protected $maxSize; //最大文件上传大小
9. protected $canUpload; //是否可以上传
10. protected $doUpFile; //上传的文件名
11. protected $sm_File; //缩略图名称
13. private function __construct($_formName='file', $_directory='./images/uploads/', $_maxSize=1048576){ //1024*1024=1M
14. //初始化参数
15. $this->formName = $_formName;
16. $this->directory = $_directory;
17. $this->maxSize = $_maxSize;
18. $this->canUpload = true;
19. $this->doUpFile = '';
20. $this->sm_File = '';
21. }
23. //判断图片是否属于允许格式内
24. static public function Type($_formName='file'){
25. $_type = $_FILES[$_formName]['type'];
26. switch ($_type){
27. case 'image/gif':
28. if (self::$a==NULL)
29. self::$a = new imgUpload($_formName);
30. break;
31. case 'image/pjpeg':
32. if (self::$a==NULL)
33. self::$a = new imgUpload($_formName);
34. break;
35. case 'image/x-png':
36. if (self::$a==NULL)
37. self::$a = new imgUpload($_formName);
38. break;
39. default:
40. self::$a = false;
41. }
42. return self::$a;
43. }
45. //获取文件大小
46. public function getSize($_format='K'){
47. if ($this->canUpload) {
48. if (0 == $_FILES[$this->formName]['size']) {
49. $this->canUpload = false;
50. return $this->canUpload;
51. break;
52. }
53. switch ($_format){
54. case 'B':
55. return $_FILES[$this->formName]['size'];
56. break;
57. case 'K':
58. return round($_FILES[$this->formName]['size'] / 1024);
59. break;
60. case 'M':
61. return round($_FILES[$this->formName]['size'] / (1024*1024),2);
62. break;
63. }
64. }
65. }
67. //获取文件类型
68. public function getExt(){
69. if ($this->canUpload) {
70. $_name = $_FILES[$this->formName]['name'];
71. $_nameArr = explode('.',$_name);
72. $_count = count($_nameArr)-1;
73. }
74. return $_nameArr[$_count];
75. }
77. //获取文件名称
78. public function getName(){
79. if ($this->canUpload) {
80. return $_FILES[$this->formName]['name'];
81. }
82. }
84. //新建文件名
85. public function newName(){
86. return date('YmdHis').rand(0,9);
87. }
89. //上传文件
90. public function upload(){
91. if ($this->canUpload)
92. {
93. $_getSize = $this->getSize('B');
94. if (!$_getSize)
95. {
96. return $_getSize;
97. break;
98. }
99. else
100. {
101. $_newName = $this->newName();
102. $_ext = $this->getExt();
103. $_doUpload = move_uploaded_file($_FILES[$this->formName]['tmp_name'], $this->directory.$_newName.".".$_ext);
104. if ($_doUpload)
105. {
106. $this->doUpFile = $_newName;
107. }
108. return $_doUpload;
109. }
110. }
111. }
113. //创建缩略图
114. public function thumb($_dstChar='_m', $_max_len=320){ //$_dstChar:_m , _s
115. if ($this->canUpload && $this->doUpFile != "") {
116. $_ext = $this->getExt();
117. $_srcImage = $this->directory.$this->doUpFile.".".$_ext;
119. //得到图片信息数组
120. $_date = getimagesize($_srcImage, &$info);
122. $src_w = $_date[0]; //源图片宽
123. $src_h = $_date[1]; //源图片高
124. $src_max_len = max($src_w, $src_h); //求得长边
125. $src_min_len = min($src_w, $src_h); //求得短边
126. $dst_w = ''; //目标图片宽
127. $dst_h = ''; //目标图片高
129. //宽高按比例缩放，最长边不大于$_max_len
130. if ($src_max_len>$_max_len)
131. {
132. $percent = $src_min_len / $src_max_len;
133. if ($src_w == $src_max_len)
134. {
135. $dst_w = $_max_len;
136. $dst_h = $percent * $dst_w;
137. }
138. else
139. {
140. $dst_h = $_max_len;
141. $dst_w = $percent * $dst_h;
142. }
143. }
144. else
145. {
146. $dst_w = $src_w;
147. $dst_h = $src_h;
148. }
150. //建立缩略图时,源图片的位置
151. $src_x = '';
152. $src_y = '';
154. //判断如果缩略图用于logo，将对其进行裁减
155. if ('s_' == $_dstChar) {
156. $src_x = $src_w * 0.10;
157. $src_y = $src_h * 0.10;
158. $src_w *= 0.8;
159. $src_h *= 0.8;
160. }
162. //判断图片类型并创建对应新图片
163. switch ($_date[2]){
164. case 1:
165. $src_im = imagecreatefromgif($_srcImage);
166. break;
167. case 2:
168. $src_im = imagecreatefromjpeg($_srcImage);
169. break;
170. case 3:
171. $src_im = imagecreatefrompng($_srcImage);
172. break;
173. case 8:
174. $src_im = imagecreatefromwbmp($_srcImage);
175. break;
176. }
178. //创建一幅新图像
179. if ($_date[2]==1) { //gif无法应用imagecreatetruecolor
180. $dst_im = imagecreate($dst_w, $dst_h);
181. }else {
182. $dst_im = imagecreatetruecolor($dst_w, $dst_h);
183. }
185. //对这副图像进行缩略图copy
186. // $bg = imagecolorallocate($dst_im,255,255,0);
187. imagecopyresized($dst_im,$src_im, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
188. //对图片进行抗锯齿操作
189. imageantialias($dst_im, true);
191. switch ($_date[2]) {
192. case 1:
193. $cr = imagegif($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
194. break;
195. case 2:
196. $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
197. break;
198. case 3://imagepng有问题，所以在这里用imagejpg代替
199. $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
200. break;
201. }
202. // $cr = imagejpeg($dst_im, $this->directory.$_dstChar.$this->doUpFile, 90);
203. if ($cr) {
204. $this->sm_File = $this->directory.$this->doUpFile.$_dstChar.".".$_ext;
206. return $this->sm_File;
207. }else {
208. return false;
209. }
210. }
211. imagedestroy($dst_im);
212. imagedestroy($cr);
213. }
215. //得到上传后的文件名
216. public function getUpFile(){
217. if ($this->doUpFile!='') {
218. $_ext = $this->getExt();
219. return $this->doUpFile.".".$_ext;
220. }else {
221. return false;
222. }
223. }
225. //得到上传后的文件全路径
226. public function getFilePatch(){
227. if ($this->doUpFile!='') {
228. $_ext = $this->getExt();
229. return $this->directory.$this->doUpFile.".".$_ext;
230. }else {
231. return false;
232. }
233. }
235. //得到缩略图文件全路径
236. public function getThumb(){
237. if ($this->sm_File!='') {
238. return $this->sm_File;
239. }else {
240. return false;
241. }
242. }
243. //得到上传文件的路径
244. public function getDirectory(){
245. if ($this->directory!='') {
246. return $this->directory;
247. }else {
248. return false;
249. }
250. }
251. }
252. ?>

复制代码

图片上传, PHP