php 根據url自動產生縮圖

原理：設定apache rewrite ，當圖片不存在時，調用php建立圖片。
例如
原圖路徑為：http://localhost/upload/news/2013/07/21/1.jpg
縮圖路徑為：http://localhost/supload/news/2013/07/21/1.jpg

當訪問 http://localhost/supload/news/2013/07/21/1.jpg 時，如圖片存在，則顯示圖片。否則，調用createthumb.php產生圖片。

目錄結構如下：
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目錄

PicThumb.class.php 用法請查看這裡

需要開啟apache rewrite

sudo a2enmod rewrite

.htaccess

<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} -dRewriteRule ^.*$ - [NC,L]RewriteRule ^.*$ createthumb.php?path=%{REQUEST_URI} [NC,L]</IfModule>

createthumb.php

<?phpdefine('WWW_PATH', dirname(dirname(__FILE__))); // 網站www目錄require(WWW_PATH.'/PicThumb.class.php'); // include PicThumb.class.phprequire(WWW_PATH.'/ThumbConfig.php');    // include ThumbConfig.php$logfile = WWW_PATH.'/createthumb.log';  // 記錄檔$source_path = WWW_PATH.'/upload/';      // 原路徑$dest_path = WWW_PATH.'/supload/';       // 目標路徑$path = isset($_GET['path'])? $_GET['path'] : '';  // 訪問的圖片URL// 檢查pathif(!$path){    exit();}// 擷取圖片URI$relative_url = str_replace($dest_path, '', WWW_PATH.$path);// 擷取type$type = substr($relative_url, 0, strpos($relative_url, '/'));// 擷取config$config = isset($thumb_config[$type])? $thumb_config[$type] : '';// 檢查configif(!$config || !isset($config['fromdir'])){    exit();}// 原圖檔案$source = str_replace('/'.$type.'/', '/'.$config['fromdir'].'/', $source_path.$relative_url);// 目標檔案 $dest = $dest_path.$relative_url;// 建立縮圖$obj = new PicThumb($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

<?php$thumb_config = array(    'news' => array(        'fromdir' => 'news', // 來源目錄        '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'    ));?>

訪問這三個路徑後會按config自動產生縮圖http://localhost/supload/news/2013/07/21/1.jpghttp://localhost/supload/news_1/2013/07/21/1.jpghttp://localhost/supload/article/2013/07/21/2.jpg

源碼下載地址：點擊下載