php缩略图生成类(支持imagemagick与gd库)

3. /** 缩略图生成类,支持imagemagick及gd库两种处理

4. * Date: 2013-07-15
5. * Author: fdipzone
6. * Ver: 1.2
7. * edit: bbs.it-home.org
8. * Func:
9. * public set_config: 设置参数
10. * public create_thumb: 生成缩略图
11. * private fit: 缩略图片
12. * private crop: 裁剪图片
13. * private gd_fit: GD库缩略图片
14. * private gd_crop: GD库裁剪图片
15. * private get_size: 获取要转换的size
16. * private get_crop_offset: 获取裁图的偏移量
17. * private add_watermark: 添加水印
18. * private check_handler: 判断处理程序是否已安装
19. * private create_dirs: 创建目录
20. * private exists: 判断参数是否存在
21. * private to_log: 记录log
22. * private hex2rgb: hex颜色转rgb颜色
23. * private get_file_ext: 获取图片类型
24. *
25. * ver: 1.1 增加GD库处理
26. * ver: 1.2 增加width,height错误参数处理
27. * 增加当图片colorspace不为RGB时作转RGB处理
28. * 修正使用crop保存为gif时出现透明无效区域问题，使用+repage参数，删除透明无效区域即可
29. *
30. * tips:建议使用imagemagick
31. * GD库不支持透明度水印,如果必须使用透明水印,请将水印图片做成有透明度。
32. * GD库输出gif如加透明水印，会有问题。
33. */
35. class PicThumb{ // class start
37. private $_log = null; // log file
38. private $_handler = null; // 进行图片处理的程序,imagemagick/gd库
39. private $_type = 'fit'; // fit or crop
40. private $_source = null; // 原图路径
41. private $_dest = null; // 缩略图路径
42. private $_watermark = null; // 水印图片
43. private $_opacity = 75; // 水印圖片透明度,gd库不支持
44. private $_gravity = 'SouthEast'; // 水印摆放位置 NorthWest, North, NorthEast, West, Center, East, SouthWest, South, SouthEast
45. private $_geometry = '+10+10'; // 水印定位,gd库不支持
46. private $_croppos = 'TL'; // 截图的位置 TL TM TR ML MM MR BL BM BR
47. private $_bgcolor = null; // 填充的背景色
48. private $_quality = 90; // 生成的图片质量
49. private $_width = null; // 指定区域宽度
50. private $_height = null; // 指定区域高度
53. // 初始化
54. public function __construct($logfile=''){
55. if($logfile!=''){
56. $this->_log = $logfile;
57. }
58. }
61. // 设置参数
62. public function set_config($param=array()){
63. $this->_handler = $this->exists($param, 'handler')? strtolower($param['handler']) : null;
64. $this->_type = $this->exists($param, 'type')? strtolower($param['type']) : 'fit';
65. $this->_watermark = $this->exists($param, 'watermark')? $param['watermark'] : null;
66. $this->_opacity = $this->exists($param, 'opacity')? $param['opacity'] : 75;
67. $this->_gravity = $this->exists($param, 'gravity')? $param['gravity'] : 'SouthEast';
68. $this->_geometry = $this->exists($param, 'geometry')? $param['geometry'] : '+10+10';
69. $this->_croppos = $this->exists($param, 'croppos')? $param['croppos'] : 'TL';
70. $this->_bgcolor = $this->exists($param, 'bgcolor')? $param['bgcolor'] : null;
71. $this->_quality = $this->exists($param, 'quality')? $param['quality'] : 90;
72. $this->_width = $this->exists($param, 'width')? $param['width'] : null;
73. $this->_height = $this->exists($param, 'height')? $param['height'] : null;
74. }
76. /** 创建缩略图
77. * @param String $source 原图
78. * @param String $dest 目标图
79. * @return boolean
80. */
81. public function create_thumb($source, $dest){
83. // 检查使用的handler是否已安装
84. if(!$this->check_handler()){
85. $this->to_log('handler not installed');
86. return false;
87. }
89. // 判断区域宽高是否正确
90. if(!is_numeric($this->_width) || !is_numeric($this->_height) || $this->_width<=0 || $this->_height<=0){
91. $this->to_log('width or height invalid');
92. return false;
93. }
95. // 判断源文件是否存在
96. if(!file_exists($source)){
97. $this->to_log($source.' not exists');
98. return false;
99. }
101. // 创建目标文件路径
102. if(!$this->create_dirs($dest)){
103. $this->to_log(dirname($dest).' create fail');
104. return false;
105. }
107. $this->_source = $source; // 源文件
108. $this->_dest = $dest; // 目标文件
110. // 处理图片
111. switch($this->_type){
112. case 'fit':
113. if($this->_handler=='imagemagick'){
114. return $this->fit();
115. }else{
116. return $this->gd_fit();
117. }
118. break;
120. case 'crop':
121. if($this->_handler=='imagemagick'){
122. return $this->crop();
123. }else{
124. return $this->gd_crop();
125. }
126. break;
128. default:
129. $this->to_log($this->_type.' not fit and crop');
130. return false;
131. }
133. }
136. /** 按比例压缩或拉伸图片
137. * @return boolean
138. */
139. private function fit(){
141. // 判断是否填充背景
142. $bgcolor = ($this->_bgcolor!=null)?
143. sprintf(" -background '%s' -gravity center -extent '%sx%s' ", $this->_bgcolor, $this->_width, $this->_height) : "";
145. // 判断是否要转为RGB
146. $source_info = getimagesize($this->_source);
147. $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';
149. // 命令行
150. $cmd = sprintf("convert -resize '%sx%s' '%s' %s -quality %s %s '%s'", $this->_width, $this->_height, $this->_source, $bgcolor, $this->_quality, $colorspace, $this->_dest);
152. // 记录执行的命令
153. $this->to_log($cmd);
155. // 执行命令
156. exec($cmd);
158. // 添加水印
159. $this->add_watermark($this->_dest);
161. return is_file($this->_dest)? true : false;
163. }
166. /** 裁剪图片
167. * @return boolean
168. */
169. private function crop(){
171. // 获取生成的图片尺寸
172. list($pic_w, $pic_h) = $this->get_size();
174. // 获取截图的偏移量
175. list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);
177. // 判断是否要转为RGB
178. $source_info = getimagesize($this->_source);
179. $colorspace = (!isset($source_info['channels']) || $source_info['channels']!=3)? ' -colorspace RGB ' : '';
181. // 命令行
182. $cmd = sprintf("convert -resize '%sx%s' '%s' -quality %s %s -crop %sx%s+%s+%s +repage '%s'", $pic_w, $pic_h, $this->_source, $this->_quality, $colorspace, $this->_width, $this->_height, $offset_w, $offset_h, $this->_dest);
184. // 记录执行的命令
185. $this->to_log($cmd);
187. // 执行命令
188. exec($cmd);
190. // 添加水印
191. $this->add_watermark($this->_dest);
193. return is_file($this->_dest)? true : false;
195. }
198. /** GD库按比例压缩或拉伸图片
199. * @return boolean
200. */
201. private function gd_fit(){
203. // 获取生成的图片尺寸
204. list($pic_w, $pic_h) = $this->get_size();
206. list($owidth, $oheight, $otype) = getimagesize($this->_source);
208. switch($otype){
209. case 1: $source_img = imagecreatefromgif($this->_source); break;
210. case 2: $source_img = imagecreatefromjpeg($this->_source); break;
211. case 3: $source_img = imagecreatefrompng($this->_source); break;
212. default: return false;
213. }
215. // 按比例缩略/拉伸图片
216. $new_img = imagecreatetruecolor($pic_w, $pic_h);
217. imagecopyresampled($new_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);
219. // 判断是否填充背景
220. if($this->_bgcolor!=null){
221. $bg_img = imagecreatetruecolor($this->_width, $this->_height);
222. $rgb = $this->hex2rgb($this->_bgcolor);
223. $bgcolor =imagecolorallocate($bg_img, $rgb['r'], $rgb['g'], $rgb['b']);
224. imagefill($bg_img, 0, 0, $bgcolor);
225. imagecopy($bg_img, $new_img, (int)(($this->_width-$pic_w)/2), (int)(($this->_height-$pic_h)/2), 0, 0, $pic_w, $pic_h);
226. $new_img = $bg_img;
227. }
229. // 获取目标图片的类型
230. $dest_ext = $this->get_file_ext($this->_dest);
232. // 生成图片
233. switch($dest_ext){
234. case 1: imagegif($new_img, $this->_dest, $this->_quality); break;
235. case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;
236. case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;
237. }
239. if(isset($source_img)){
240. imagedestroy($source_img);
241. }
243. if(isset($new_img)){
244. imagedestroy($new_img);
245. }
247. // 添加水印
248. $this->add_watermark($this->_dest);
250. return is_file($this->_dest)? true : false;
252. }
255. /** GD库裁剪图片
256. * @return boolean
257. */
258. private function gd_crop(){
260. // 获取生成的图片尺寸
261. list($pic_w, $pic_h) = $this->get_size();
263. // 获取截图的偏移量
264. list($offset_w, $offset_h) = $this->get_crop_offset($pic_w, $pic_h);
266. list($owidth, $oheight, $otype) = getimagesize($this->_source);
268. switch($otype){
269. case 1: $source_img = imagecreatefromgif($this->_source); break;
270. case 2: $source_img = imagecreatefromjpeg($this->_source); break;
271. case 3: $source_img = imagecreatefrompng($this->_source); break;
272. default: return false;
273. }
275. // 按比例缩略/拉伸图片
276. $tmp_img = imagecreatetruecolor($pic_w, $pic_h);
277. imagecopyresampled($tmp_img, $source_img, 0, 0, 0, 0, $pic_w, $pic_h, $owidth, $oheight);
279. // 裁剪图片
280. $new_img = imagecreatetruecolor($this->_width, $this->_height);
281. imagecopyresampled($new_img, $tmp_img, 0, 0, $offset_w, $offset_h, $this->_width, $this->_height, $this->_width, $this->_height);
283. // 获取目标图片的类型
284. $dest_ext = $this->get_file_ext($this->_dest);
286. // 生成图片
287. switch($dest_ext){
288. case 1: imagegif($new_img, $this->_dest, $this->_quality); break;
289. case 2: imagejpeg($new_img, $this->_dest, $this->_quality); break;
290. case 3: imagepng($new_img, $this->_dest, (int)(($this->_quality-1)/10)); break;
291. }
293. if(isset($source_img)){
294. imagedestroy($source_img);
295. }
297. if(isset($tmp_img)){
298. imagedestroy($tmp_img);
299. }
301. if(isset($new_img)){
302. imagedestroy($new_img);
303. }
305. // 添加水印
306. $this->add_watermark($this->_dest);
308. return is_file($this->_dest)? true : false;
310. }
313. /** 获取目标图生成的size
314. * @return Array $width, $height
315. */
316. private function get_size(){
317. list($owidth, $oheight) = getimagesize($this->_source);
318. $width = (int)($this->_width);
319. $height = (int)($this->_height);
321. switch($this->_type){
322. case 'fit':
323. $pic_w = $width;
324. $pic_h = (int)($pic_w*$oheight/$owidth);
325. if($pic_h>$height){
326. $pic_h = $height;
327. $pic_w = (int)($pic_h*$owidth/$oheight);
328. }
329. break;
330. case 'crop':
331. if($owidth>$oheight){
332. $pic_h = $height;
333. $pic_w = (int)($pic_h*$owidth/$oheight);
334. }else{
335. $pic_w = $width;
336. $pic_h = (int)($pic_w*$oheight/$owidth);
337. }
338. break;
339. }
341. return array($pic_w, $pic_h);
342. }
345. /** 获取截图的偏移量
346. * @param int $pic_w 图宽度
347. * @param int $pic_h 图高度
348. * @return Array $offset_w, $offset_h
349. */
350. private function get_crop_offset($pic_w, $pic_h){
351. $offset_w = 0;
352. $offset_h = 0;
354. switch(strtoupper($this->_croppos)){
355. case 'TL':
356. $offset_w = 0;
357. $offset_h = 0;
358. break;
360. case 'TM':
361. $offset_w = (int)(($pic_w-$this->_width)/2);
362. $offset_h = 0;
363. break;
365. case 'TR':
366. $offset_w = (int)($pic_w-$this->_width);
367. $offset_h = 0;
368. break;
370. case 'ML':
371. $offset_w = 0;
372. $offset_h = (int)(($pic_h-$this->_height)/2);
373. break;
375. case 'MM':
376. $offset_w = (int)(($pic_w-$this->_width)/2);
377. $offset_h = (int)(($pic_h-$this->_height)/2);
378. break;
380. case 'MR':
381. $offset_w = (int)($pic_w-$this->_width);
382. $offset_h = (int)(($pic_h-$this->_height)/2);
383. break;
385. case 'BL':
386. $offset_w = 0;
387. $offset_h = (int)($pic_h-$this->_height);
388. break;
390. case 'BM':
391. $offset_w = (int)(($pic_w-$this->_width)/2);
392. $offset_h = (int)($pic_h-$this->_height);
393. break;
395. case 'BR':
396. $offset_w = (int)($pic_w-$this->_width);
397. $offset_h = (int)($pic_h-$this->_height);
398. break;
399. }
401. return array($offset_w, $offset_h);
402. }
405. /** 添加水印
406. * @param String $dest 图片路径
407. */
408. private function add_watermark($dest){
409. if($this->_watermark!=null && file_exists($this->_watermark) && file_exists($dest)){
410. list($owidth, $oheight, $otype) = getimagesize($dest);
411. list($w, $h, $wtype) = getimagesize($this->_watermark);
413. // 水印图比原图要小才加水印
414. if($w<=$owidth && $h<=$oheight){
416. if($this->_handler=='imagemagick'){ // imagemagick 添加水印
418. $cmd = sprintf("composite -gravity %s -geometry %s -dissolve %s '%s' %s %s", $this->_gravity, $this->_geometry, $this->_opacity, $this->_watermark, $dest, $dest);
420. $this->to_log($cmd);
422. exec($cmd);
424. }else{ // gd 添加水印
426. switch($wtype){
427. case 1: $water_img = imagecreatefromgif($this->_watermark); break;
428. case 2: $water_img = imagecreatefromjpeg($this->_watermark); break;
429. case 3: $water_img = imagecreatefrompng($this->_watermark); break;
430. default: return false;
431. }
433. switch($otype){
434. case 1: $dest_img = imagecreatefromgif($dest); break;
435. case 2: $dest_img = imagecreatefromjpeg($dest); break;
436. case 3: $dest_img = imagecreatefrompng($dest); break;
437. default: return false;
438. }
440. // 水印位置
441. switch(strtolower($this->_gravity)){
442. case 'northwest':
443. $posX = 0;
444. $posY = 0;
445. break;
446. case 'north':
447. $posX = ($owidth - $w) / 2;
448. $posY = 0;
449. break;
450. case 'northeast':
451. $posX = $owidth - $w;
452. $posY = 0;
453. break;
454. case 'west':
455. $posX = 0;
456. $posY = ($oheight - $h) / 2;
457. break;
458. case 'center':
459. $posX = ($owidth - $w) / 2;
460. $posY = ($oheight - $h) / 2;
461. break;
462. case 'east':
463. $posX = $owidth - $w;
464. $posY = ($oheight - $h) / 2;
465. break;
466. case 'southwest':
467. $posX = 0;
468. $posY = $oheight - $h;
469. break;
470. case 'south':
471. $posX = ($owidth - $w) / 2;
472. $posY = $oheight - $h;
473. break;
474. case 'southeast':
475. $posX = $owidth - $w;
476. $posY = $oheight - $h;
477. break;
478. }
480. imagealphablending($dest_img, true);
481. imagecopy($dest_img, $water_img, $posX, $posY, 0, 0, $w, $h);
483. switch($otype){
484. case 1:imagegif($dest_img, $dest, $this->_quality); break;
485. case 2:imagejpeg($dest_img, $dest, $this->_quality); break;
486. case 3:imagepng($dest_img, $dest, (int)(($this->_quality-1)/10)); break;
487. }
489. if(isset($water_img)){
490. imagedestroy($water_img);
491. }
493. if(isset($dest_img)){
494. imagedestroy($dest_img);
495. }
497. }
498. }
499. }
500. }
503. /** 判断处理程序是否已安装
504. * @return boolean
505. */
506. private function check_handler(){
508. $handler = $this->_handler;
510. if(!in_array($handler, array('imagemagick', 'gd', null))){
511. return false;
512. }
514. // 检查是否有安装imagemagick
515. $imagemagick_installed = strstr(shell_exec('convert -version'),'Version: ImageMagick')!=''? true : false;
517. // 检查是否有安装gd库
518. $gd_installed = function_exists('gd_info')? true : false;
520. switch($handler){
521. case 'imagemagick':
522. return $imagemagick_installed;
523. break;
525. case 'gd':
526. return $gd_installed;
527. break;
529. case null:
530. if($imagemagick_installed){
531. $this->_handler = 'imagemagick';
532. return true;
533. }
535. if($gd_installed){
536. $this->_handler = 'gd';
537. return true;
538. }
539. break;
540. }
542. return false;
543. }
546. /** 创建图片目录
547. * @param String $path
548. * @return boolean
549. */
550. private function create_dirs($dest){
551. if(!is_dir(dirname($dest))){
552. return mkdir(dirname($dest), 0777, true);
553. }
554. return true;
555. }
558. /** 判断参数是否存在
559. * @param Array $obj 数组对象
560. * @param String $key 要查找的key
561. * @return boolean
562. */
563. private function exists($obj,$key=''){
564. if($key==''){
565. return isset($obj) && !empty($obj);
566. }else{
567. $keys = explode('.',$key);
568. for($i=0,$max=count($keys); $i<$max; $i++){
569. if(isset($obj[$keys[$i]])){
570. $obj = $obj[$keys[$i]];
571. }else{
572. return false;
573. }
574. }
575. return isset($obj) && !empty($obj);
576. }
577. }
580. /** 记录log
581. * @param String $msg 要记录的log讯息
582. */
583. private function to_log($msg){
584. if($this->_log){
585. $msg = '['.date('Y-m-d H:i:s').']'.$msg."\r\n";
586. file_put_contents($this->_log, $msg, FILE_APPEND);
587. }
588. }
591. /** hex颜色转rgb颜色
592. * @param String $color hex颜色
593. * @return Array
594. */
595. private function hex2rgb($hexcolor){
596. $color = str_replace('#', '', $hexcolor);
597. if (strlen($color) > 3) {
598. $rgb = array(
599. 'r' => hexdec(substr($color, 0, 2)),
600. 'g' => hexdec(substr($color, 2, 2)),
601. 'b' => hexdec(substr($color, 4, 2))
602. );
603. } else {
604. $r = substr($color, 0, 1) . substr($color, 0, 1);
605. $g = substr($color, 1, 1) . substr($color, 1, 1);
606. $b = substr($color, 2, 1) . substr($color, 2, 1);
607. $rgb = array(
608. 'r' => hexdec($r),
609. 'g' => hexdec($g),
610. 'b' => hexdec($b)
611. );
612. }
613. return $rgb;
614. }
617. /** 获取图片类型
618. * @param String $file 图片路径
619. * @return int
620. */
621. private function get_file_ext($file){
622. $filename = basename($file);
623. list($name, $ext)= explode('.', $filename);
625. $ext_type = 0;
627. switch(strtolower($ext)){
628. case 'jpg':
629. case 'jpeg':
630. $ext_type = 2;
631. break;
632. case 'gif':
633. $ext_type = 1;
634. break;
635. case 'png':
636. $ext_type = 3;
637. break;
638. }
640. return $ext_type;
641. }
643. } // class end
645. ?>
646. demo：
647. [php] view plaincopy
648. define('ROOT', dirname(__FILE__));
650. require(ROOT."/PicThumb.class.php");
652. $logfile = ROOT.'/PicThumb.log';
653. $source1 = ROOT.'/pic/source.jpg';
654. $dest1 = ROOT.'/pic/1.jpg';
655. $dest2 = ROOT.'/pic/2.gif';
656. $dest3 = ROOT.'/pic/3.png';
658. $source2 = ROOT.'/pic/source_cmyk.jpg';
659. $dest4 = ROOT.'/pic/4.jpg';
660. $dest5 = ROOT.'/pic/5.gif';
661. $dest6 = ROOT.'/pic/6.png';
663. $watermark = ROOT.'/pic/watermark.png';
665. // 按比例生成缩略图
666. $param = array(
667. 'type' => 'fit',
668. 'width' => 100,
669. 'height' => 100,
670. );
672. $obj = new PicThumb($logfile);
673. $obj->set_config($param);
674. $flag = $obj->create_thumb($source1, $dest1);
676. if($flag){ // bbs.it-home.org
677. echo '';
678. }else{
679. echo 'create thumb fail';
680. }
682. // 按比例生成缩略图,不足部分用#FF0000填充
683. $param = array(
684. 'type' => 'fit',
685. 'width' => 100,
686. 'height' => 100,
687. 'bgcolor' => '#FFFF00'
688. );
690. $obj = new PicThumb($logfile);
691. $obj->set_config($param);
692. $flag = $obj->create_thumb($source1, $dest2);
694. if($flag){
695. echo '';
696. }else{
697. echo 'create thumb fail';
698. }
700. // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50
701. $param = array(
702. 'type' => 'crop',
703. 'croppos' => 'BM',
704. 'width' => 250,
705. 'height' => 250,
706. 'watermark' => $watermark,
707. 'opacity' => 50,
708. 'gravity' => 'SouthWest'
709. );
711. $obj = new PicThumb($logfile);
712. $obj->set_config($param);
713. $flag = $obj->create_thumb($source1, $dest3);
715. if($flag){
716. echo '';
717. }else{
718. echo 'create thumb fail';
719. }
721. // 按比例生成缩略图 CMYK格式
722. $param = array(
723. 'type' => 'fit',
724. 'width' => 100,
725. 'height' => 100,
726. );
728. $obj = new PicThumb($logfile);
729. $obj->set_config($param);
730. $flag = $obj->create_thumb($source2, $dest4);
732. if($flag){
733. echo '';
734. }else{
735. echo 'create thumb fail';
736. }

737. // 按比例生成缩略图,不足部分用#FF0000填充 CMYK格式

738. $param = array(
739. 'type' => 'fit',
740. 'width' => 100,
741. 'height' => 100,
742. 'bgcolor' => '#FFFF00'
743. );
745. $obj = new PicThumb($logfile);
746. $obj->set_config($param);
747. $flag = $obj->create_thumb($source2, $dest5);
749. if($flag){
750. echo '';
751. }else{
752. echo 'create thumb fail';
753. }
755. // 裁剪250x250的缩略图,裁剪位置是底部中间,水印位置西南,透明度50 CMYK格式
756. $param = array(
757. 'type' => 'crop',
758. 'croppos' => 'BM',
759. 'width' => 250,
760. 'height' => 250,
761. 'watermark' => $watermark,
762. 'opacity' => 50,
763. 'gravity' => 'SouthWest'
764. );
766. $obj = new PicThumb($logfile);
767. $obj->set_config($param);
768. $flag = $obj->create_thumb($source2, $dest6);
770. if($flag){
771. echo '';
772. }else{
773. echo 'create thumb fail';
774. }
775. ?>

>>> php缩略图生成类源码下载地址