这篇文章主要介绍了php将图片保存为不同尺寸图片的图片类,涉及php图片操作的保存、复制、缩略图等常用技巧,并封装成一个类文件以便于调用,非常具有实用价值,需要的朋友可以参考下。

本文实例讲述了php将图片保存为不同规格的图片类，分享给大家供大家参考，具体如下：

图片处理类.imagecls.php如下：

1. <?php
2. /**
3. 图片处理类
4. */
5. class imagecls
6. {
7. /**
8. * 文件信息
9. */
10. var $file = array();
11. /**
12. * 保存目录
13. */
14. var $dir = '';
15. /**
16. * 错误代码
17. */
18. var $error_code = 0;
19. /**
20. * 文件上传最大KB
21. */
22. var $max_size = -1;
23. function es_imagecls()
24. {
25. }
26. private function checkSize($size)
27. {
28. return !($size > $this->max_size) || (-1 == $this->max_size);
29. }
30. /**
31. * 处理上传文件
32. * @param array $file 上传的文件
33. * @param string $dir 保存的目录
34. * @return bool
35. */
36. function init($file, $dir = 'temp')
37. {
38. if(!is_array($file) || emptyempty($file) || !$this->isUploadFile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0)
39. {
40. $this->file = array();
41. $this->error_code = -1;
42. return false;
43. }
44. else
45. {
46. $file['size'] = intval($file['size']);
47. $file['name'] = trim($file['name']);
48. $file['thumb'] = '';
49. $file['ext'] = $this->fileExt($file['name']);
50. $file['name'] = htmlspecialchars($file['name'], ENT_QUOTES);
51. $file['is_image'] = $this->isImageExt($file['ext']);
52. $file['file_dir'] = $this->getTargetDir($dir);
53. $file['prefix'] = md5(microtime(true)).rand(10,99);
54. $file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //相对
55. $file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //物理
56. $this->file = &$file;
57. $this->error_code = 0;
58. return true;
59. }
60. }
61. /**
62. * 保存文件
63. * @return bool
64. */
65. function save()
66. {
67. if(emptyempty($this->file) || emptyempty($this->file['tmp_name']))
68. $this->error_code = -101;
69. elseif(!$this->checkSize($this->file['size']))
70. $this->error_code = -105;
71. elseif(!$this->file['is_image'])
72. $this->error_code = -102;
73. elseif(!$this->saveFile($this->file['tmp_name'], $this->file['local_target']))
74. $this->error_code = -103;
75. elseif($this->file['is_image'] && (!$this->file['image_info'] = $this->getImageInfo($this->file['local_target'], true)))
76. {
77. $this->error_code = -104;
78. @unlink($this->file['local_target']);
79. }
80. else
81. {
82. $this->error_code = 0;
83. return true;
84. }
85. return false;
86. }
87. /**
88. * 获取错误代码
89. * @return number
90. */
91. function error()
92. {
93. return $this->error_code;
94. }
95. /**
96. * 获取文件扩展名
97. * @return string
98. */
99. function fileExt($file_name)
100. {
101. return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
102. }
103. /**
104. * 根据扩展名判断文件是否为图像
105. * @param string $ext 扩展名
106. * @return bool
107. */
108. function isImageExt($ext)
109. {
110. static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
111. return in_array($ext, $img_ext) ? 1 : 0;
112. }
113. /**
114. * 获取图像信息
115. * @param string $target 文件路径
116. * @return mixed
117. */
118. function getImageInfo($target)
119. {
120. $ext = es_imagecls::fileExt($target);
121. $is_image = es_imagecls::isImageExt($ext);
122. if(!$is_image)
123. return false;
124. elseif(!is_readable($target))
125. return false;
126. elseif($image_info = @getimagesize($target))
127. {
128. list($width, $height, $type) = !emptyempty($image_info) ? $image_info : array('', '', '');
129. $size = $width * $height;
130. if($is_image && !in_array($type, array(1,2,3,6,13)))
131. return false;
132. $image_info['type'] = strtolower(substr(image_type_to_extension($image_info[2]),1));
133. return $image_info;
134. }
135. else
136. return false;
137. }
138. /**
139. * 获取是否充许上传文件
140. * @param string $source 文件路径
141. * @return bool
142. */
143. function isUploadFile($source)
144. {
145. return $source && ($source != 'none') && (is_uploaded_file($source) || is_uploaded_file(str_replace('\\\\', '\\', $source)));
146. }
147. /**
148. * 获取保存的路径
149. * @param string $dir 指定的保存目录
150. * @return string
151. */
152. function getTargetDir($dir)
153. {
154. if (!is_dir(APP_ROOT_PATH."public/".$dir)) {
155. @mkdir(APP_ROOT_PATH."public/".$dir);
156. @chmod(APP_ROOT_PATH."public/".$dir, 0777);
157. }
158. return $dir;
159. }
160. /**
161. * 保存文件
162. * @param string $source 源文件路径
163. * @param string $target 目录文件路径
164. * @return bool
165. */
166. private function saveFile($source, $target)
167. {
168. if(!es_imagecls::isUploadFile($source))
169. $succeed = false;
170. elseif(@copy($source, $target))
171. $succeed = true;
172. elseif(function_exists('move_uploaded_file') && @move_uploaded_file($source, $target))
173. $succeed = true;
174. elseif (@is_readable($source) && (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb')))
175. {
176. while (!feof($fp_s))
177. {
178. $s = @fread($fp_s, 1024 * 512);
179. @fwrite($fp_t, $s);
180. }
181. fclose($fp_s);
182. fclose($fp_t);
183. $succeed = true;
184. }
185. if($succeed)
186. {
187. $this->error_code = 0;
188. @chmod($target, 0644);
189. @unlink($source);
190. }
191. else
192. {
193. $this->error_code = 0;
194. }
195. return $succeed;
196. }
197. public function thumb($image,$maxWidth=200,$maxHeight=50,$gen = 0,$interlace=true,$filepath = '',$is_preview = true)
198. {
199. $info = es_imagecls::getImageInfo($image);
200. if($info !== false)
201. {
202. $srcWidth = $info[0];
203. $srcHeight = $info[1];
204. $type = $info['type'];
205. $interlace = $interlace? 1:0;
206. unset($info);
207. if($maxWidth > 0 && $maxHeight > 0)
208. $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例
209. elseif($maxWidth == 0)
210. $scale = $maxHeight/$srcHeight;
211. elseif($maxHeight == 0)
212. $scale = $maxWidth/$srcWidth;
213. $paths = pathinfo($image);
214. $paths['filename'] = trim(strtolower($paths['basename']),".".strtolower($paths['extension']));
215. $basefilename = explode("_",$paths['filename']);
216. $basefilename = $basefilename[0];
217. if(emptyempty($filepath))
218. {
219. if($is_preview)
220. $thumbname = $paths['dirname'].'/'.$basefilename.'_'.$maxWidth.'x'.$maxHeight.'.jpg';
221. else
222. $thumbname = $paths['dirname'].'/'.$basefilename.'o_'.$maxWidth.'x'.$maxHeight.'.jpg';
223. }
224. else
225. $thumbname = $filepath;
226. $thumburl = str_replace(APP_ROOT_PATH,'./',$thumbname);
227. if($scale >= 1)
228. {
229. // 超过原图大小不再缩略
230. $width = $srcWidth;
231. $height = $srcHeight;
232. if(!$is_preview)
233. {
234. //非预览模式写入原图
235. file_put_contents($thumbname,file_get_contents($image)); //用原图写入
236. return array('url'=>$thumburl,'path'=>$thumbname);
237. }
238. }
239. else
240. {
241. // 缩略图尺寸
242. $width = (int)($srcWidth*$scale);
243. $height = (int)($srcHeight*$scale);
244. }
245. if($gen == 1)
246. {
247. $width = $maxWidth;
248. $height = $maxHeight;
249. }
250. // 载入原图
251. $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
252. if(!function_exists($createFun))
253. $createFun = 'imagecreatefromjpeg';
254. $srcImg = $createFun($image);
255. //创建缩略图
256. if($type!='gif' && function_exists('imagecreatetruecolor'))
257. $thumbImg = imagecreatetruecolor($width, $height);
258. else
259. $thumbImg = imagecreate($width, $height);
260. $x = 0;
261. $y = 0;
262. if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
263. {
264. $resize_ratio = $maxWidth/$maxHeight;
265. $src_ratio = $srcWidth/$srcHeight;
266. if($src_ratio >= $resize_ratio)
267. {
268. $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
269. $width = ($height * $srcWidth) / $srcHeight;
270. }
271. else
272. {
273. $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
274. $height = ($width * $srcHeight) / $srcWidth;
275. }
276. }
277. // 复制图片
278. if(function_exists("imagecopyresampled"))
279. imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight);
280. else
281. imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight);
282. if('gif'==$type || 'png'==$type) {
283. $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色
284. imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
285. }
286. // 对jpeg图形设置隔行扫描
287. if('jpg'==$type || 'jpeg'==$type)
288. imageinterlace($thumbImg,$interlace);
289. // 生成图片
290. imagejpeg($thumbImg,$thumbname,100);
291. imagedestroy($thumbImg);
292. imagedestroy($srcImg);
293. return array('url'=>$thumburl,'path'=>$thumbname);
294. }
295. return false;
296. }
297. public function make_thumb($srcImg,$srcWidth,$srcHeight,$type,$maxWidth=200,$maxHeight=50,$gen = 0)
298. {
299. $interlace = $interlace? 1:0;
300. if($maxWidth > 0 && $maxHeight > 0)
301. $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例
302. elseif($maxWidth == 0)
303. $scale = $maxHeight/$srcHeight;
304. elseif($maxHeight == 0)
305. $scale = $maxWidth/$srcWidth;
306. if($scale >= 1)
307. {
308. // 超过原图大小不再缩略
309. $width = $srcWidth;
310. $height = $srcHeight;
311. }
312. else
313. {
314. // 缩略图尺寸
315. $width = (int)($srcWidth*$scale);
316. $height = (int)($srcHeight*$scale);
317. }
318. if($gen == 1)
319. {
320. $width = $maxWidth;
321. $height = $maxHeight;
322. }
323. //创建缩略图
324. if($type!='gif' && function_exists('imagecreatetruecolor'))
325. $thumbImg = imagecreatetruecolor($width, $height);
326. else
327. $thumbImg = imagecreatetruecolor($width, $height);
328. $x = 0;
329. $y = 0;
330. if($gen == 1 && $maxWidth > 0 && $maxHeight > 0)
331. {
332. $resize_ratio = $maxWidth/$maxHeight;
333. $src_ratio = $srcWidth/$srcHeight;
334. if($src_ratio >= $resize_ratio)
335. {
336. $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2;
337. $width = ($height * $srcWidth) / $srcHeight;
338. }
339. else
340. {
341. $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2;
342. $height = ($width * $srcHeight) / $srcWidth;
343. }
344. }
345. // 复制图片
346. if(function_exists("imagecopyresampled"))
347. imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight);
348. else
349. imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight);
350. if('gif'==$type || 'png'==$type) {
351. $background_color = imagecolorallocate($thumbImg, 255,255,255); // 指派一个绿色
352. imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图
353. }
354. // 对jpeg图形设置隔行扫描
355. if('jpg'==$type || 'jpeg'==$type)
356. imageinterlace($thumbImg,$interlace);
357. return $thumbImg;
358. }
359. public function water($source,$water,$alpha=80,$position="0")
360. {
361. //检查文件是否存在
362. if(!file_exists($source)||!file_exists($water))
363. return false;
364. //图片信息
365. $sInfo = es_imagecls::getImageInfo($source);
366. $wInfo = es_imagecls::getImageInfo($water);
367. //如果图片小于水印图片，不生成图片
368. if($sInfo["0"] < $wInfo["0"] || $sInfo['1'] < $wInfo['1'])
369. return false;
370. if(is_animated_gif($source))
371. {
372. require_once APP_ROOT_PATH."system/utils/gif_encoder.php";
373. require_once APP_ROOT_PATH."system/utils/gif_reader.php";
374. $gif = new GIFReader();
375. $gif->load($source);
376. foreach($gif->IMGS['frames'] as $k=>$img)
377. {
378. $im = imagecreatefromstring($gif->getgif($k));
379. //为im加水印
380. $sImage=$im;
381. $wCreateFun="imagecreatefrom".$wInfo['type'];
382. if(!function_exists($wCreateFun))
383. $wCreateFun = 'imagecreatefromjpeg';
384. $wImage=$wCreateFun($water);
385. //设定图像的混色模式
386. imagealphablending($wImage, true);
387. switch (intval($position))
388. {
389. case 0: break;
390. //左上
391. case 1:
392. $posY=0;
393. $posX=0;
394. //生成混合图像
395. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
396. break;
397. //右上
398. case 2:
399. $posY=0;
400. $posX=$sInfo[0]-$wInfo[0];
401. //生成混合图像
402. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
403. break;
404. //左下
405. case 3:
406. $posY=$sInfo[1]-$wInfo[1];
407. $posX=0;
408. //生成混合图像
409. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
410. break;
411. //右下
412. case 4:
413. $posY=$sInfo[1]-$wInfo[1];
414. $posX=$sInfo[0]-$wInfo[0];
415. //生成混合图像
416. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
417. break;
418. //居中
419. case 5:
420. $posY=$sInfo[1]/2-$wInfo[1]/2;
421. $posX=$sInfo[0]/2-$wInfo[0]/2;
422. //生成混合图像
423. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
424. break;
425. }
426. //end im加水印
427. ob_start();
428. imagegif($sImage);
429. $content = ob_get_contents();
430. ob_end_clean();
431. $frames [ ] = $content;
432. $framed [ ] = $img['frameDelay'];
433. }
434. $gif_maker = new GIFEncoder (
435. $frames,
436. $framed,
437. 0,
438. 2,
439. 0, 0, 0,
440. "bin" //bin为二进制 url为地址
441. );
442. $image_rs = $gif_maker->GetAnimation ( );
443. //如果没有给出保存文件名，默认为原图像名
444. @unlink($source);
445. //保存图像
446. file_put_contents($source,$image_rs);
447. return true;
448. }
449. //建立图像
450. $sCreateFun="imagecreatefrom".$sInfo['type'];
451. if(!function_exists($sCreateFun))
452. $sCreateFun = 'imagecreatefromjpeg';
453. $sImage=$sCreateFun($source);
454. $wCreateFun="imagecreatefrom".$wInfo['type'];
455. if(!function_exists($wCreateFun))
456. $wCreateFun = 'imagecreatefromjpeg';
457. $wImage=$wCreateFun($water);
458. //设定图像的混色模式
459. imagealphablending($wImage, true);
460. switch (intval($position))
461. {
462. case 0: break;
463. //左上
464. case 1:
465. $posY=0;
466. $posX=0;
467. //生成混合图像
468. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
469. break;
470. //右上
471. case 2:
472. $posY=0;
473. $posX=$sInfo[0]-$wInfo[0];
474. //生成混合图像
475. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
476. break;
477. //左下
478. case 3:
479. $posY=$sInfo[1]-$wInfo[1];
480. $posX=0;
481. //生成混合图像
482. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
483. break;
484. //右下
485. case 4:
486. $posY=$sInfo[1]-$wInfo[1];
487. $posX=$sInfo[0]-$wInfo[0];
488. //生成混合图像
489. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
490. break;
491. //居中
492. case 5:
493. $posY=$sInfo[1]/2-$wInfo[1]/2;
494. $posX=$sInfo[0]/2-$wInfo[0]/2;
495. //生成混合图像
496. imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
497. break;
498. }
499. //如果没有给出保存文件名，默认为原图像名
500. @unlink($source);
501. //保存图像
502. imagejpeg($sImage,$source,100);
503. imagedestroy($sImage);
504. }
505. }
506. if(!function_exists('image_type_to_extension'))
507. {
508. function image_type_to_extension($imagetype)
509. {
510. if(emptyempty($imagetype))
511. return false;
512. switch($imagetype)
513. {
514. case IMAGETYPE_GIF : return '.gif';
515. case IMAGETYPE_JPEG : return '.jpeg';
516. case IMAGETYPE_PNG : return '.png';
517. case IMAGETYPE_SWF : return '.swf';
518. case IMAGETYPE_PSD : return '.psd';
519. case IMAGETYPE_BMP : return '.bmp';
520. case IMAGETYPE_TIFF_II : return '.tiff';
521. case IMAGETYPE_TIFF_MM : return '.tiff';
522. case IMAGETYPE_JPC : return '.jpc';
523. case IMAGETYPE_JP2 : return '.jp2';
524. case IMAGETYPE_JPX : return '.jpf';
525. case IMAGETYPE_JB2 : return '.jb2';
526. case IMAGETYPE_SWC : return '.swc';
527. case IMAGETYPE_IFF : return '.aiff';
528. case IMAGETYPE_WBMP : return '.wbmp';
529. case IMAGETYPE_XBM : return '.xbm';
530. default : return false;
531. }
532. }
533. }
534. ?>

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

1. //获取相应规格的图片地址
2. //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
3. function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true)
4. {
5. if($width==0)
6. $new_path = $img_path;
7. else
8. {
9. $img_name = substr($img_path,0,-4);
10. $img_ext = substr($img_path,-3);
11. if($is_preview)
12. $new_path = $img_name."_".$width."x".$height.".jpg";
13. else
14. $new_path = $img_name."o_".$width."x".$height.".jpg";
15. if(!file_exists($new_path))
16. {
17. require_once "imagecls.php";
18. $imagec = new imagecls();
19. $thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"",$is_preview);
20. if(app_conf("PUBLIC_DOMAIN_ROOT")!='')
21. {
22. $paths = pathinfo($new_path);
23. $path = str_replace("./","",$paths['dirname']);
24. $filename = $paths['basename'];
25. $pathwithoupublic = str_replace("public/","",$path);
26. $file_data = @file_get_contents($path.$file);
27. $img = @imagecreatefromstring($file_data);
28. if($img!==false)
29. {
30. $save_path = "public/".$path;
31. if(!is_dir($save_path))
32. {
33. @mk_dir($save_path);
34. }
35. @file_put_contents($save_path.$name,$file_data);
36. }
37. }
38. }
39. }
40. return $new_path;
41. }

3.使用方法:

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