|The path segment of the upload directory.
(Note: The default value of this variable depends on other variables, such as the values set in $1, after $2 is executed)
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The relative path to the upload directory. This is used to construct the URLs for viewing uploaded files.
In most cases this is just the path component, such as "/w/images". If uploaded files are served from a different domain, this can be a fully-qualified URL with hostname, such as "http://upload.wikimedia.org/wikipedia/en".
If the variable contains a local path (without "http://") then it must start with a slash, otherwise it will result in a bad URL. (For example if you set it to "foldername" it will result in files being loaded from "http://www.example.comfoldername" - note the missing slash after ".com")
To enable permission checks on image files, $wgUploadPath can be pointed to the img_auth.php script ( $wgUploadPath = $wgScriptPath."/img_auth.php"; ) - see 手册:图片授权 for instructions.
$wgUploadDirectory) than from where MediaWiki will try to retrieve them for viewing (