htaccess的重写仅在文件不存在 [英] htaccess rewrite only if file doesn't exist

问题描述

使用的.htaccessmod-rewrite，我想重写URL，检查该文件是否存在，如果不使用原来的URL这是第一次重新编写过程中删除的部分再次改写到另一个URL。

Using .htaccess mod rewrite, I would like to rewrite a url, check if that file exists, and if not rewrite again to another url using part of the original url which was removed during the 1st re-write.

例如，如果原始网址是本

For example, if the original url is this

/images/3001/zebra.jpg

/images/3001/zebra.jpg

我想检查文件是否存在/images/cached/zebra.jpg和服务于它，如果它确实存在。

I would like to check if the file exists /images/cached/zebra.jpg and serve it if it does exist.

如果不是我想重写/image.php?id=3001

And if not I would like to rewrite to /image.php?id=3001

非常感谢， 菲尔

推荐答案

在你的文档根htaccess文件，之前无论规则，你可能已经有添加这些规则：

In the htaccess file in your document root, add these rules before whatever rules you may already have there:

RewriteEngine On

# cached copy exists
RewriteCond %{REQUEST_URI} ^/images/[0-9]+/(.+)$
RewriteCond %{DOCUMENT_ROOT}/images/cached/%1 -f
RewriteRule ^ /images/cached/%1 [L]

# cached copy doesn't exist
RewriteCond %{REQUEST_URI} ^/images/([0-9]+)/(.+)$
RewriteCond %{DOCUMENT_ROOT}/images/cached/%2 !-f
RewriteRule ^ /image.php?id=%1 [L]

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