时间:2021-07-01 10:21:17 帮助过:32人阅读
原理:设置apache rewrite ,当图片不存在时,调用php创建图片。
例如:
原图路径为:http://localhost/upload/news/2013/07/21/1.jpg
缩略图路径为:http://localhost/supload/news/2013/07/21/1.jpg
当访问 http://localhost/supload/news/2013/07/21/1.jpg 时,如图片存在,则显示图片。否则,调用createthumb.php生成图片。
目录结构如下:
www/PicThumb.class.php
www/ThumbConfig.php
www/upload/news/2013/07/21/1.jpg
www/upload/article/2013/07/21/2.jpg
www/supload/.htaccess
www/supload/watermark.png
www/supload/createthumb.php
http://localhost/ 指向 www目录
PicThumb.class.php 用法请查看这里:http://www.bitsCN.com/article/55530.htm
需要开启apache rewrite:
- sudo a2enmod rewrite
.htaccess文件如下:
- <ifmodule mod_rewrite.c="">
- RewriteEngine On
- # '-s' (is regular file, with size)
- # '-l' (is symbolic link)
- # '-d' (is directory)
- # 'ornext|OR' (or next condition)
- # 'nocase|NC' (no case)
- # 'last|L' (last rule)
- RewriteCond %{REQUEST_FILENAME} -s [OR]
- RewriteCond %{REQUEST_FILENAME} -l [OR]
- RewriteCond %{REQUEST_FILENAME} -d
- RewriteRule ^.*$ - [NC,L]
- RewriteRule ^.*$ createthumb.php?path=%{REQUEST_URI} [NC,L]
- </ifmodule>
createthumb.php文件如下:
- <?php
- define('WWW_PATH', dirname(dirname(__FILE__))); // 站点www目录
- require(WWW_PATH.'/PicThumb.class.php'); // include PicThumb.class.php
- require(WWW_PATH.'/ThumbConfig.php'); // include ThumbConfig.php
- $logfile = WWW_PATH.'/createthumb.log'; // 日志文件
- $source_path = WWW_PATH.'/upload/'; // 原路径
- $dest_path = WWW_PATH.'/supload/'; // 目标路径
- $path = isset($_GET['path'])? $_GET['path'] : ''; // 访问的图片URL
- // 检查path
- if(!$path){
- exit();
- }
- // 获取图片URI
- $relative_url = str_replace($dest_path, '', WWW_PATH.$path);
- // 获取type
- $type = substr($relative_url, 0, strpos($relative_url, '/'));
- // 获取config
- $config = isset($thumb_config[$type])? $thumb_config[$type] : '';
- // 检查config
- if(!$config || !isset($config['fromdir'])){
- exit();
- }
- // 原图文件
- $source = str_replace('/'.$type.'/', '/'.$config['fromdir'].'/', $source_path.$relative_url);
- // 目标文件
- $dest = $dest_path.$relative_url;
- // 创建缩略图
- $obj = new PicThumb($logfile);
- $obj->set_config($config);
- if($obj->create_thumb($source, $dest)){
- ob_clean();
- header('content-type:'.mime_content_type($dest));
- exit(file_get_contents($dest));
- }
- ?>
ThumbConfig.php文件如下:
- <?php
- $thumb_config = array(
- 'news' => array(
- 'fromdir' => 'news', // 来源目录
- 'type' => 'fit',
- 'width' => 100,
- 'height' => 100,
- 'bgcolor' => '#FF0000'
- ),
- 'news_1' => array(
- 'fromdir' => 'news',
- 'type' => 'fit',
- 'width' => 200,
- 'height' => 200,
- 'bgcolor' => '#FFFF00'
- ),
- 'article' => array(
- 'fromdir' => 'article',
- 'type' => 'crop',
- 'width' => 250,
- 'height' => 250,
- 'watermark' => WWW_PATH.'/supload/watermark.png'
- )
- );
- ?>
访问这三个路径后会按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
本文所述实例完整代码点击此处本站下载。
希望本文所述对大家的php程序设计有所帮助。