wordpress上传的文件在哪？
WordPress默认的上传文件的目录是/wp-content/uploads，而且文件是以年月的形式组织的，虽然我们可以去掉按照年月组织的选项，或者更改存储路径，但这个设置会应用到全局，不能按照特定条件选择特定目录存储文件。
WordPress上传默认设置
有时候将不同类型的文件分门别类存储，似乎比年月目录更有意义。例如幻灯片应该存储在slides目录下，下载文件应该存储在downloads文件夹下。就说幻灯片slideshow，我比较喜欢用自定义文章类型（Custom Post Type）实现，有些幻灯片脚本比较个性，不支持绝对路径，必须用相对路径，然后用base参数设置相对于哪个文件夹，这样幻灯片必须存储在某个特定的文件夹中，年月形式显然不满足要求。所以，我们需要条件化的设置上传目录。
为Custom Post Type设置上传目录
假设我要将所有在幻灯片类型的文章中上传的文件存储到/wp-content/uploads/slides文件夹中，将下面的代码放到主题的functions.php中即可
function custom_upload_directory( $uploads ) { $id = $_REQUEST['post_id']; $parent = get_post( $id )->post_parent; if( "post-type" == get_post_type( $id ) || "post-type" == get_post_type( $parent ) ) { $subdir = 'slides'; $uploads['subdir'] = $subdir; $uploads['path'] = $uploads['basedir'].DIRECTORY_SEPARATOR.$subdir; $uploads['url'] = $uploads['baseurl'].'/'.$subdir; } return $uploads;}add_filter( 'upload_dir', 'custom_upload_directory' );将post-type替换成自己的自定义文章类型名称，将你要创建的子目录赋值给$subdir。
将文件保存到插件目录
下面的代码要用在插件中，文件会保存到插件目录下的uploads文件夹下。
/** * Change Upload Directory for Custom Post-Type * * This will change the upload directory for a custom post-type. Attachments will * now be uploaded to an "uploads" directory within the folder of your plugin. Make * sure you swap out "post-type" in the if-statement with the appropriate value... */function custom_upload_directory( $args ) { $id = $_REQUEST['post_id']; $parent = get_post( $id )->post_parent; // Check the post-type of the current post if( "post-type" == get_post_type( $id ) || "post-type" == get_post_type( $parent ) ) { $args['path'] = plugin_dir_path(__FILE__) . "uploads"; $args['url'] = plugin_dir_url(__FILE__) . "uploads"; $args['basedir'] = plugin_dir_path(__FILE__) . "uploads"; $args['baseurl'] = plugin_dir_url(__FILE__) . "uploads"; } return $args;}add_filter( 'upload_dir', 'custom_upload_directory' );如果要以年月形式保存，修改一下代码即可
$args['path'] = plugin_dir_path(__FILE__) . "uploads" . $args['subdir'];$args['url'] = plugin_dir_url(__FILE__) . "uploads" . $args['subdir'];这段代码来自 http://wordpress.stackexchange.com/questions/35657/how-to-add-more-upload-directories/
为后台管理页面设定upload_dir
用wp_editor在后台管理页面（比如用add_menu_page创建的页面）创建一个媒体上传功能，希望所有从该页面上传的文件都保存到wp-content/uploads/myfolder目录下。
由 于ajax上传是直接调用wp-admin/async_upload.php文件，只能通过post_id获取post信息，而后台管理页面并非 post，所以判断什么时候应该更改upload_dir有些麻烦。此时，可以用采用判断页面referer的方法,用wp_get_referer() 函数获取引荐url，如果正好与我们的option page url想等，就更该目录。
function custom_upload_directory( $uploads ) { if( wp_get_referer() == 'http://domain.com/wp-admin/admin.php?page=myoptionpage'){ $subdir = 'myfolder'; $uploads['subdir'] = $subdir; $uploads['path'] = $uploads['basedir'].DIRECTORY_SEPARATOR.$subdir; $uploads['url'] = $uploads['baseurl'].'/'.$subdir; } return $uploads;}add_filter( 'upload_dir', 'custom_upload_directory' );参考信息
filter:upload_dir是在wp_upload_dir()函数中调用的
$upload_dir = wp_upload_dir();$upload_dir now contains something like the following (if successful)Array ( [path] => C:/path/to/wordpress/wp-content/uploads/2010/05 [url] => http://example.com/wp-content/uploads/2010/05 [subdir] => /2010/05 [basedir] => C:/path/to/wordpress/wp-content/uploads [baseurl] => http://example.com/wp-content/uploads [error] =>)更多WordPress技术文章，请访问WordPress教程栏目！
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