php根据url自动生成缩略图实现代码

3. RewriteEngine On
5. # '-s' (is regular file, with size)
6. # '-l' (is symbolic link)
7. # '-d' (is directory)
8. # 'ornext|OR' (or next condition)
9. # 'nocase|NC' (no case)
10. # 'last|L' (last rule)
12. RewriteCond %{REQUEST_FILENAME} -s [OR]
13. RewriteCond %{REQUEST_FILENAME} -l [OR]
14. RewriteCond %{REQUEST_FILENAME} -d
15. RewriteRule ^.*$ - [NC,L]
16. RewriteRule ^.*$ createthumb.php?path=%{REQUEST_URI} [NC,L]

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2、createthumb.php文件：

2. define('WWW_PATH', dirname(dirname(__FILE__))); // 站点www目录
4. require(WWW_PATH.'/PicThumb.class.php'); // include PicThumb.class.php
5. require(WWW_PATH.'/ThumbConfig.php'); // include ThumbConfig.php
7. $logfile = WWW_PATH.'/createthumb.log'; // 日志文件
8. $source_path = WWW_PATH.'/upload/'; // 原路径
9. $dest_path = WWW_PATH.'/supload/'; // 目标路径
11. $path = isset($_GET['path'])? $_GET['path'] : ''; // 访问的图片URL
13. // 检查path
14. if(!$path){
15. exit();
16. }
18. // 获取图片URI
19. $relative_url = str_replace($dest_path, '', WWW_PATH.$path);
21. // 获取type
22. $type = substr($relative_url, 0, strpos($relative_url, '/'));
24. // 获取config
25. $config = isset($thumb_config[$type])? $thumb_config[$type] : '';
27. // 检查config
28. if(!$config || !isset($config['fromdir'])){
29. exit();
30. }
32. // 原图文件
33. $source = str_replace('/'.$type.'/', '/'.$config['fromdir'].'/', $source_path.$relative_url);
35. // 目标文件
36. $dest = $dest_path.$relative_url;
38. // 创建缩略图
39. $obj = new PicThumb($logfile);
40. $obj->set_config($config);
41. if($obj->create_thumb($source, $dest)){
42. ob_clean();
43. header('content-type:'.mime_content_type($dest));
44. exit(file_get_contents($dest));
45. }
47. ?>

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3、ThumbConfig.php文件：

2. $thumb_config = array(
4. 'news' => array(
5. 'fromdir' => 'news', // 来源目录
6. 'type' => 'fit',
7. 'width' => 100,
8. 'height' => 100,
9. 'bgcolor' => '#FF0000'
10. ),
12. 'news_1' => array(
13. 'fromdir' => 'news',
14. 'type' => 'fit',
15. 'width' => 200,
16. 'height' => 200,
17. 'bgcolor' => '#FFFF00'
18. ),
20. 'article' => array(
21. 'fromdir' => 'article',
22. 'type' => 'crop',
23. 'width' => 250,
24. 'height' => 250,
25. 'watermark' => WWW_PATH.'/supload/watermark.png'
26. )
28. );
29. ?>

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访问以下三个路径后会按config自动生成缩略图： http://localhost/supload/news/2013/07/21/1.jpg http://localhost/supload/news_1/2013/07/21/1.jpg http://localhost/supload/article/2013/07/21/2.jpg