Note -- 正如Kaiser在评论中正确指出的那样，多站点在站点之间共享用户。如果您删除了一个，则会将她从您网络中的所有站点中删除。如果这不是你的意图，那么调查一下remove_user_from_blog().

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而不是wp_delete_user(), 使用wpmu_delete_user(). 正在查看the source code, wpmu_delete_user() 首先检查所涉及的用户是否是网络中任何站点上的用户，如果是，则将其删除，清除与其帐户关联的所有链接和元数据，然后最终按预期删除该用户。

This WordPress support thread 是什么指引我朝着这个方向。

在从中删除用户之前重新分配帖子source of wpmu_delete_user():

do_action( \'wpmu_delete_user\', $id );

$blogs = get_blogs_of_user( $id );

if ( ! empty( $blogs ) ) {
        foreach ( $blogs as $blog ) {
                switch_to_blog( $blog->userblog_id );
                remove_user_from_blog( $id, $blog->userblog_id );

                $post_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_author = %d", $id ) );
                foreach ( (array) $post_ids as $post_id ) {
                        wp_delete_post( $post_id );
                }

                // Clean links
                $link_ids = $wpdb->get_col( $wpdb->prepare( "SELECT link_id FROM $wpdb->links WHERE link_owner = %d", $id ) );

                if ( $link_ids ) {
                        foreach ( $link_ids as $link_id )
                                wp_delete_link( $link_id );
                }

                restore_current_blog();
        }
}

因此，以编程方式删除用户时的默认操作是从她作为用户的每个站点（博客）中查找并删除她的帖子。然而，有一个操作挂钩就在前面运行，方便地命名为wpmu_delete_user. 因此，在删除之前，您应该能够通过编程方式重新分配要删除的用户的帖子：

add_action( \'wpmu_delete_user\', \'wpse130705_reassign_posts\' );
function wpse130705_reassign_posts( $id ) {
    // $id should contain the user\'s ID
    $blogs = get_blogs_of_user( $id );
    $assign_to = 99; // some other user\'s ID; you\'ll have to work out what this will be
    if( ! empty( $blogs ) ) {
        foreach( $blogs as $blog ) {
            switch_to_blog( $blog->userblog_id );
            $post_ids = $wpdb->get_col( 
                $wpdb->prepare( 
                    "SELECT ID FROM $wpdb->posts WHERE post_author=%d", $id 
                )
            );
            if( $post_ids ) {
                foreach( $post_ids as $post_id ) {
                    $wpdb->update( 
                        $table = $wpdb->posts,
                        $data  = array( \'post_author\' => $assign_to ),
                        $where = array( \'post_author\' => $id ),
                        $format = \'%d\',
                        $where_format = \'%d\'
                    );
                }
            }
            restore_current_blog();
        }
    }
}