将图片保存为不同规格的图片的php代码

3. /**

4. 图片处理类
5. */
6. class imagecls
7. {
8. /**
9. * 文件信息
10. */
11. var $file = array();
12. /**
13. * 保存目录
14. */
15. var $dir = '';
16. /**
17. * 错误代码
18. */
19. var $error_code = 0;
20. /**
21. * 文件上传最大KB
22. */
23. var $max_size = -1;

24. function es_imagecls()

25. {

26. }

28. private function checkSize($size)
29. {
30. return !($size > $this->max_size) || (-1 == $this->max_size);
31. }
33. /**
34. * 处理上传文件
35. * @param array $file 上传的文件
36. * @param string $dir 保存的目录
37. * @return bool
38. */
39. function init($file, $dir = 'temp')
40. {
41. if(!is_array($file) || empty($file) || !$this->isUploadFile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0)
42. {
43. $this->file = array();
44. $this->error_code = -1;
45. return false;
46. }
47. else
48. {
49. $file['size'] = intval($file['size']);
50. $file['name'] = trim($file['name']);
51. $file['thumb'] = '';
52. $file['ext'] = $this->fileExt($file['name']);
53. $file['name'] = htmlspecialchars($file['name'], ENT_QUOTES);
54. $file['is_image'] = $this->isImageExt($file['ext']);
55. $file['file_dir'] = $this->getTargetDir($dir);
56. $file['prefix'] = md5(microtime(true)).rand(10,99);
57. $file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //相对
58. $file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg';//物理
59. $this->file = &$file;
60. $this->error_code = 0;
61. return true;
62. }
63. }

64. /**

65. * 保存文件
66. * @return bool
67. */
68. function save()
69. {
70. if(empty($this->file) || empty($this->file['tmp_name']))
71. $this->error_code = -101;
72. elseif(!$this->checkSize($this->file['size']))
73. $this->error_code = -105;
74. elseif(!$this->file['is_image'])
75. $this->error_code = -102;
76. elseif(!$this->saveFile($this->file['tmp_name'], $this->file['local_target']))
77. $this->error_code = -103;
78. elseif($this->file['is_image'] &&
79. (!$this->file['image_info'] = $this->getImageInfo($this->file['local_target'], true)))
80. {
81. $this->error_code = -104;
82. @unlink($this->file['local_target']);
83. }
84. else
85. {
86. $this->error_code = 0;
87. return true;
88. }
89. return false;
90. }

91. /**

92. * 获取错误代码
93. * @return number
94. */
95. function error()
96. {
97. return $this->error_code;
98. }

99. /**

100. * 获取文件扩展名
101. * @return string
102. */
103. function fileExt($file_name)
104. {
105. return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
106. }

107. /**

108. * 根据扩展名判断文件是否为图像
109. * @param string $ext 扩展名
110. * @return bool
111. */
112. function isImageExt($ext)
113. {
114. static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
115. return in_array($ext, $img_ext) ? 1 : 0;
116. }

117. /**

118. * 获取图像信息
119. * @param string $target 文件路径
120. * @return mixed
121. */
122. function getImageInfo($target)
123. {
124. $ext = es_imagecls::fileExt($target);
125. $is_image = es_imagecls::isImageExt($ext);

126. if(!$is_image)

127. return false;
128. elseif(!is_readable($target))
129. return false;
130. elseif($image_info = @getimagesize($target))
131. {
132. list($width, $height, $type) = !empty($image_info) ? $image_info :
133. array('', '', '');
134. $size = $width * $height;
135. if($is_image && !in_array($type, array(1,2,3,6,13)))
136. return false;

137. $image_info['type'] =

138. strtolower (substr(image_type_to_extension($image_info[2]),1));
139. return $image_info;
140. }
141. else
142. return false;
143. }

144. /**

145. * 获取是否充许上传文件
146. * @param string $source 文件路径
147. * @return bool
148. */
149. function isUploadFile($source)
150. {
151. return $source && ($source != 'none') &&
152. (is_uploaded_file($source) || is_uploaded_file(str_replace('\\', '\', $source)));
153. }

154. /**

155. * 获取保存的路径
156. * @param string $dir 指定的保存目录
157. * @return string
158. */
159. function getTargetDir($dir)
160. {
161. if (!is_dir(APP_ROOT_PATH."public/".$dir)) {
162. @mkdir(APP_ROOT_PATH."public/".$dir);
163. @chmod(APP_ROOT_PATH."public/".$dir, 0777);
164. }
165. return $dir;
166. }

167. /**

168. * 保存文件
169. * @param string $source 源文件路径
170. * @param string $target 目录文件路径
171. * @return bool
172. */
173. private function saveFile($source, $target)
174. {
175. if(!es_imagecls::isUploadFile($source))
176. $succeed = false;
177. elseif(@copy($source, $target))
178. $succeed = true;
179. elseif(function_exists('move_uploaded_file') &&
180. @move_uploaded_file($source, $target))
181. $succeed = true;
182. elseif (@is_readable($source) &&
183. (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb')))
184. {
185. while (!feof($fp_s))
186. {
187. $s = @fread($fp_s, 1024 * 512);
188. @fwrite($fp_t, $s);
189. }
190. fclose($fp_s);
191. fclose($fp_t);
192. $succeed = true;
193. }

194. if($succeed)

195. {
196. $this->error_code = 0;
197. @chmod($target, 0644);
198. @unlink($source);
199. }
200. else
201. {
202. $this->error_code = 0;
203. }

204. return $succeed;

205. }

206. public function thumb($image,$maxWidth=200,$maxHeight=50,$gen = 0,

207. $interlace=true,$filepath = '',$is_preview = true)
208. {
209. $info = es_imagecls::getImageInfo($image);

210. if($info !== false)

211. {
212. $srcWidth = $info[0];
213. $srcHeight = $info[1];
214. $type = $info['type'];

215. $interlace = $interlace? 1:0;

216. unset($info);

217. if($maxWidth > 0 && $maxHeight > 0)

218. $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
219. // 计算缩放比例
220. elseif($maxWidth == 0)
221. $scale = $maxHeight/$srcHeight;
222. elseif($maxHeight == 0)
223. $scale = $maxWidth/$srcWidth;

225. $paths = pathinfo($image);
226. $paths['filename'] = trim(strtolower($paths['basename']),
227. ".".strtolower($paths['extension']));
228. $basefilename = explode("_",$paths['filename']);
229. $basefilename = $basefilename[0];
230. if(empty($filepath))
231. {
232. if($is_preview)
233. $thumbname = $paths['dirname'].'/'.$basefilename.
234. '_'.$maxWidth.'x'.$maxHeight.'.jpg';
235. else
236. $thumbname = $paths['dirname'].'/'.$basefilename.
237. 'o_'.$maxWidth.'x'.$maxHeight.'.jpg';
238. }
239. else
240. $thumbname = $filepath;

241. $thumburl = str_replace(APP_ROOT_PATH,'./',$thumbname);

243. if($scale >= 1)
244. {
245. // 超过原图大小不再缩略
246. $width = $srcWidth;
247. $height = $srcHeight;
248. if(!$is_preview)
249. {
250. //非预览模式写入原图
251. file_put_contents($thumbname,file_get_contents($image)); //用原图写入
252. return array('url'=>$thumburl,'path'=>$thumbname);
253. }
254. }
255. else
256. {
257. // 缩略图尺寸
258. $width = (int)($srcWidth*$scale);
259. $height = (int)($srcHeight*$scale);
260. }
262. if($gen == 1)
263. {
264. $width = $maxWidth;
265. $height = $maxHeight;
266. }

267. // 载入原图

268. $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
269. if(!function_exists($createFun))
270. $createFun = 'imagecreatefromjpeg';

271. $srcImg = $createFun($image);

272. //创建缩略图

273. if($type!='gif' && function_exists('imagecreatetruecolor'))
274. $thumbImg = imagecreatetruecolor($width, $height);
275. else
276. $thumbImg = imagecreate($width, $height);

277. $x = 0;

278. $y = 0;

279. if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)

280. {
281. $resize_ratio = $maxWidth/$maxHeight;
282. $src_ratio = $srcWidth/$srcHeight;
283. if($src_ratio >= $resize_ratio)
284. {
285. $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
286. $width = ($height * $srcWidth) / $srcHeight;
287. }
288. else
289. {
290. $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
291. $height = ($width * $srcHeight) / $srcWidth;
292. }
293. }

294. // 复制图片

295. if(function_exists("imagecopyresampled"))
296. imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
297. $srcWidth,$srcHeight);
298. else
299. imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
300. $srcWidth,$srcHeight);
301. if('gif'==$type || 'png'==$type) {
302. $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色
303. imagecolortransparent($thumbImg,$background_color);
304. // 设置为透明色，若注释掉该行则输出绿色的图
305. }

306. // 对jpeg图形设置隔行扫描

307. if('jpg'==$type || 'jpeg'==$type)
308. imageinterlace($thumbImg,$interlace);

309. // 生成图片

310. imagejpeg($thumbImg,$thumbname,100);
311. imagedestroy($thumbImg);
312. imagedestroy($srcImg);

313. return array('url'=>$thumburl,'path'=>$thumbname);

314. }
315. return false;
316. }

317. public function make_thumb($srcImg,$srcWidth,$srcHeight,$type,$maxWidth=200,

318. $maxHeight=50,$gen = 0)
319. {

320. $interlace = $interlace? 1:0;

321. if($maxWidth > 0 && $maxHeight > 0)

322. $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight);
323. // 计算缩放比例
324. elseif($maxWidth == 0)
325. $scale = $maxHeight/$srcHeight;
326. elseif($maxHeight == 0)
327. $scale = $maxWidth/$srcWidth;

328. if($scale >= 1)

329. {
330. // 超过原图大小不再缩略
331. $width = $srcWidth;
332. $height = $srcHeight;
333. }
334. else
335. {
336. // 缩略图尺寸
337. $width = (int)($srcWidth*$scale);
338. $height = (int)($srcHeight*$scale);
339. }

340. if($gen == 1)

341. {
342. $width = $maxWidth;
343. $height = $maxHeight;
344. }

346. //创建缩略图
347. if($type!='gif' && function_exists('imagecreatetruecolor'))
348. $thumbImg = imagecreatetruecolor($width, $height);
349. else
350. $thumbImg = imagecreatetruecolor($width, $height);

351. $x = 0;

352. $y = 0;

353. if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)

354. {
355. $resize_ratio = $maxWidth/$maxHeight;
356. $src_ratio = $srcWidth/$srcHeight;
357. if($src_ratio >= $resize_ratio)
358. {
359. $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
360. $width = ($height * $srcWidth) / $srcHeight;
361. }
362. else
363. {
364. $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
365. $height = ($width * $srcHeight) / $srcWidth;
366. }
367. }

368. // 复制图片

369. if(function_exists("imagecopyresampled"))
370. imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
371. $srcWidth,$srcHeight);
372. else
373. imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height,
374. $srcWidth,$srcHeight);
375. if('gif'==$type || 'png'==$type) {
376. $background_color = imagecolorallocate($thumbImg, 255,255,255);
377. // 指派一个绿色
378. imagecolortransparent($thumbImg,$background_color);
379. // 设置为透明色，若注释掉该行则输出绿色的图
380. }

381. // 对jpeg图形设置隔行扫描

382. if('jpg'==$type || 'jpeg'==$type)
383. imageinterlace($thumbImg,$interlace);

384. return $thumbImg;

386. }

388. public function water($source,$water,$alpha=80,$position="0")
389. {
390. //检查文件是否存在
391. if(!file_exists($source)||!file_exists($water))
392. return false;

393. //图片信息

394. $sInfo = es_imagecls::getImageInfo($source);
395. $wInfo = es_imagecls::getImageInfo($water);

396. //如果图片小于水印图片，不生成图片

397. if($sInfo["0"] < $wInfo["0"] || $sInfo['1'] < $wInfo['1'])
398. return false;

401. if(is_animated_gif($source))
402. {
403. require_once APP_ROOT_PATH."system/utils/gif_encoder.php";
404. require_once APP_ROOT_PATH."system/utils/gif_reader.php";

405. $gif = new GIFReader();

406. $gif->load($source);
407. foreach($gif->IMGS['frames'] as $k=>$img)
408. {
409. $im = imagecreatefromstring($gif->getgif($k));
410. //为im加水印
411. $sImage=$im;
412. $wCreateFun="imagecreatefrom".$wInfo['type'];
413. if(!function_exists($wCreateFun))
414. $wCreateFun = 'imagecreatefromjpeg';
415. $wImage=$wCreateFun($water);
417. //设定图像的混色模式
418. imagealphablending($wImage, true);
419. switch (intval($position))
420. {
421. case 0: break;
422. //左上
423. case 1:
424. $posY=0;
425. $posX=0;
426. //生成混合图像
427. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
428. break;
429. //右上
430. case 2:
431. $posY=0;
432. $posX=$sInfo[0]-$wInfo[0];
433. //生成混合图像
434. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
435. break;
436. //左下
437. case 3:
438. $posY=$sInfo[1]-$wInfo[1];
439. $posX=0;
440. //生成混合图像
441. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
442. break;
443. //右下
444. case 4:
445. $posY=$sInfo[1]-$wInfo[1];
446. $posX=$sInfo[0]-$wInfo[0];
447. //生成混合图像
448. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
449. break;
450. //居中
451. case 5:
452. $posY=$sInfo[1]/2-$wInfo[1]/2;
453. $posX=$sInfo[0]/2-$wInfo[0]/2;
454. //生成混合图像
455. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
456. break;
457. }
458. //end im加水印
461. ob_start();
462. imagegif($sImage);
463. $content = ob_get_contents();
464. ob_end_clean();
465. $frames [ ] = $content;
466. $framed [ ] = $img['frameDelay'];
467. }
470. $gif_maker = new GIFEncoder (
471. $frames,
472. $framed,
473. 0,
474. 2,
475. 0, 0, 0,
476. "bin" //bin为二进制 url为地址
477. );
478. $image_rs = $gif_maker->GetAnimation ( );
480. //如果没有给出保存文件名，默认为原图像名
481. @unlink($source);
482. //保存图像
483. file_put_contents($source,$image_rs);
484. return true;
485. }
487. //建立图像
488. $sCreateFun="imagecreatefrom".$sInfo['type'];
489. if(!function_exists($sCreateFun))
490. $sCreateFun = 'imagecreatefromjpeg';
491. $sImage=$sCreateFun($source);

492. $wCreateFun="imagecreatefrom".$wInfo['type'];

493. if(!function_exists($wCreateFun))
494. $wCreateFun = 'imagecreatefromjpeg';
495. $wImage=$wCreateFun($water);

496. //设定图像的混色模式

497. imagealphablending($wImage, true);

498. switch (intval($position))

499. {
500. case 0: break;
501. //左上
502. case 1:
503. $posY=0;
504. $posX=0;
505. //生成混合图像
506. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
507. break;
508. //右上
509. case 2:
510. $posY=0;
511. $posX=$sInfo[0]-$wInfo[0];
512. //生成混合图像
513. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
514. break;
515. //左下
516. case 3:
517. $posY=$sInfo[1]-$wInfo[1];
518. $posX=0;
519. //生成混合图像
520. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
521. break;
522. //右下
523. case 4:
524. $posY=$sInfo[1]-$wInfo[1];
525. $posX=$sInfo[0]-$wInfo[0];
526. //生成混合图像
527. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
528. break;
529. //居中
530. case 5:
531. $posY=$sInfo[1]/2-$wInfo[1]/2;
532. $posX=$sInfo[0]/2-$wInfo[0]/2;
533. //生成混合图像
534. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
535. break;
536. }

537. //如果没有给出保存文件名，默认为原图像名

538. @unlink($source);
539. //保存图像
540. imagejpeg($sImage,$source,100);
541. imagedestroy($sImage);
542. }
543. }

544. if(!function_exists('image_type_to_extension'))

545. {
546. function image_type_to_extension($imagetype)
547. {
548. if(empty($imagetype))
549. return false;

550. switch($imagetype)

551. {
552. case IMAGETYPE_GIF : return '.gif';
553. case IMAGETYPE_JPEG : return '.jpeg';
554. case IMAGETYPE_PNG : return '.png';
555. case IMAGETYPE_SWF : return '.swf';
556. case IMAGETYPE_PSD : return '.psd';
557. case IMAGETYPE_BMP : return '.bmp';
558. case IMAGETYPE_TIFF_II : return '.tiff';
559. case IMAGETYPE_TIFF_MM : return '.tiff';
560. case IMAGETYPE_JPC : return '.jpc';
561. case IMAGETYPE_JP2 : return '.jp2';
562. case IMAGETYPE_JPX : return '.jpf';
563. case IMAGETYPE_JB2 : return '.jb2';
564. case IMAGETYPE_SWC : return '.swc';
565. case IMAGETYPE_IFF : return '.aiff';
566. case IMAGETYPE_WBMP : return '.wbmp';
567. case IMAGETYPE_XBM : return '.xbm';
568. default : return false;
569. }
570. }
571. }
572. ?>

2.get_spec_img()调用图片类,然后再用下面的方法保存不同规格的图片并返回图片连接

2. //获取相应规格的图片地址
3. //gen=0:保持比例缩放，不剪裁,如高为0，则保证宽度按比例缩放 gen=1：保证长宽，剪裁
4. function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true)
5. {
6. if($width==0)
7. $new_path = $img_path;
8. else
9. {
10. $img_name = substr($img_path,0,-4);
11. $img_ext = substr($img_path,-3);
12. if($is_preview)
13. $new_path = $img_name."_".$width."x".$height.".jpg";
14. else
15. $new_path = $img_name."o_".$width."x".$height.".jpg";
16. if(!file_exists($new_path))
17. {
18. require_once "imagecls.php";
19. $imagec = new imagecls();
20. $thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"
21. ",$is_preview);
23. if(app_conf("PUBLIC_DOMAIN_ROOT")!='')
24. {
25. $paths = pathinfo($new_path);
26. $path = str_replace("./","",$paths['dirname']);
27. $filename = $paths['basename'];
28. $pathwithoupublic = str_replace("public/","",$path);
30. $file_data = @file_get_contents($path.$file);
31. 　 　 $img = @imagecreatefromstring($file_data);
32. 　 　 if($img!==false)
33. 　 　 {
34. 　 　 　 $save_path = "public/".$path;
35. 　 　 　 if(!is_dir($save_path))
36. 　 　 　 {
37. 　 　 　 　 @mk_dir($save_path);　 　 　
38. 　 　 　 }
39. 　 　 　 @file_put_contents($save_path.$name,$file_data);
40. 　 　 }
41. }
43. }
44. }
45. return $new_path;
46. }

3.使用方法:

2. //im:将店铺图片保存为3种规格:小图:48x48,中图120x120,大图200x200
3. $small_url=get_spec_image($data['image'],48,48,0);
4. $
5. middle_url=get_spec_image($data['image'],120,120,0);
6. $big_url=get_spec_image($data['image'],200,200,0);