本文实例讲述了php实现根据url自动生成缩略图的方法,是非常实用的功能。分享给大家供大家参考。具体方法如下:
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://www.yinxi.net/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。