wordpress中怎么设置上传文件路径

function my_upload_dir($upload) {
$upload['subdir']= '/avatar';
$upload['path']= $upload['basedir'] . $upload['subdir'];
$upload['url']= $upload['baseurl'] . $upload['subdir'];
return $upload;
}

//Handles PHP uploads in WordPress.
add_filter('upload_dir', 'my_upload_dir');
$file_attr = wp_handle_upload( $_FILES['avatar_manager_import'], $overrides );
remove_filter('upload_dir', 'my_upload_dir');