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
需要开启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} -d
RewriteRule ^.*$ - [NC,L]
RewriteRule ^.*$ createthumb.php?path=%{REQUEST_URI} [NC,L]
</IfModule>
createthumb.php
<?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
<?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
源码下载地址:点击下载