在里面

Dashboard -> Settings -> Media

 ☑；Organize my uploads into month- and year-based folders

。。。并且可以选择更改上传路径（但这当然会影响所有上传）。

（可选）您可以连接到upload_dir 筛选并更改给定post_type, 或者对于某些其他给定场景，这取决于您在何处以及在何种条件下进行这些上载。

add_filter( \'upload_dir\', \'css_upload_dir\' );

function css_upload_dir(){

    global $post;
    $post_id = $post->ID;
    $upload = wp_upload_dir();

    if( "post_type" == get_post_type($post_id) ){

        $custom_dir     = \'/skins/custom-skin/images\';
        $upload[\'path\'] = $upload[\'basedir\'] . $custom_dir;
        $upload[\'url\']  = $upload[\'baseurl\'] . $custom_dir;

        return $upload;
    }
}