哦，周日的拖延

https://github.com/maugly/Network-Terminator

试试看。还实现了“测试运行”功能，因此您可以在实际执行操作之前检查结果。

Update -> Screenshots:

试运行后：

上面链接的插件添加了用户界面，但该功能中几乎发生了所有重要的事情：

        <?php function mau_add_network_terms($terms_to_add, $siteids, $testrun = false) {

        // check if this is multisite install
        if ( !is_multisite() )
            return \'This is not a multisite WordPress installation.\';

        // very basic input check
        if ( empty($terms_to_add) || empty($siteids) || !is_array($terms_to_add) || !is_array($siteids) )
            return \'Nah, I eat only arrays!\';

        if ($testrun) $log = \'<p><em>No need to get excited. This is just a test run.</em></p>\';
        else $log = \'\';

        // loop thru blogs
        foreach ($siteids as $blog_id) :

            switch_to_blog( absint($blog_id) );

            $log .= \'<h4>\'.get_blog_details(  $blog_id  )->blogname.\':</h4>\';
            $log .= \'<ul id="ntlog">\';

            // loop thru taxonomies
            foreach ( $terms_to_add as $taxonomy => $terms ) {

                // check if taxonomy exists
                if ( taxonomy_exists($taxonomy) ) {
                    // get taxonomy name
                    $tax_name = get_taxonomy($taxonomy);
                    $tax_name = $tax_name->labels->name;

                    //loop thru terms   
                    foreach ( $terms as $term ) {

                        // check if term exists
                        if ( term_exists($term, $taxonomy) ) {
                            $log .= "<li class=\'notice\' ><em>$term already exists in the $tax_name taxonomy - not added!</em></li>";

                        } else {

                            // if it doesn\'t exist insert the $term to $taxonomy
                            $term = strip_tags($term);
                            $taxonomy = strip_tags($taxonomy);
                            if (!$testrun)
                                wp_insert_term( $term, $taxonomy );
                            $log .= "<li><b>$term</b> successfully added to the <b>$tax_name</b> taxonomy</li>"; 
                        }
                    }
                } else {
                    // tell our log that taxonomy doesn\'t exists
                    $log .= "<li class=\'notice\'><em>The $tax_name taxonomy doesn\'t exist! Skipping...</em></li>"; 
                }
            }

            $log .= \'</ul>\';    

            // we\'re done here
            restore_current_blog();

        endforeach;
        if ($testrun) $log .= \'<p><em>No need to get excited. This was just the test run.</em></p>\';
        return $log;
    } ?>

这远远不够完美（请阅读插件头部的已知问题）<欢迎您的反馈！

死亡医生的答案看起来不错，但我最终采取了不同的方法来解决这个问题。我没有在许多网站上重复相同的术语，而是让其他网站使用主页的术语表。

add_action(\'init\', \'central_taxonomies\');

function central_taxonomies () {
  global $wpdb;

  $wpdb->terms = "wp_terms";
  $wpdb->term_taxonomy = "wp_term_taxonomy";
}

您可以从插件或主题运行它（尽管我建议使用插件）。我可能会在某个时候发布一个插件来实现这一点。这种方法有两个缺点：

它只在插件已激活的子网站上有效。无法从父站点强制执行此操作all 分类法，而不仅仅是选定的分类法

<小时>Update: 我已经将其制作成一个插件，如果需要，可以在整个站点范围内激活它：MU Central Taxonomies

是的，这是可能的。很久以前，我为WPMU构建了一个这样的插件(http://natureofmind.org/30/default-categories-for-new-blogs/但不再支持）以下两个插件将是最新的：http://wordpress.org/extend/plugins/wpmu-new-blog-defaults/ 和http://premium.wpmudev.org/project/new-blog-template

作为对@Marcus Downing answer的补充，我添加了一个保护，以防止在删除MU站点时删除表。

这旨在用作mu插件。如果要在其他地方使用，请更改；muplugins\\u已加载“；挂钩到“；已加载插件；。

<?php

/**
 * Plugin name: Shared Taxonomies for Multi-site
 * Version: 0.1
 * Plugin Author: Marcus Downing, Lucas Bustamante
 * Author URI: https://wordpress.stackexchange.com/a/386318/27278
 * Description: All instances of multi-site share the same taxonomies as the main site of the network.
 */

$sharedTaxonomies = new SharedTaxonomies;

add_action(\'muplugins_loaded\', [$sharedTaxonomies, \'shareTaxonomies\'], 1, 0);
add_action(\'switch_blog\', [$sharedTaxonomies, \'shareTaxonomies\'], 1, 0);
add_filter(\'wpmu_drop_tables\', [$sharedTaxonomies, \'protectGlobalTables\'], 1, 2);

class SharedTaxonomies
{
    /**
     * Multi-sites uses term tables from the main site.
     */
    public function shareTaxonomies()
    {
        /**
         * @var wpdb $wpdb
         * @var WP_Object_Cache $wp_object_cache
         */
        global $wpdb, $wp_object_cache;

        $wpdb->terms         = $wpdb->base_prefix . \'terms\';
        $wpdb->term_taxonomy = $wpdb->base_prefix . \'term_taxonomy\';

        $wpdb->flush();
        $wp_object_cache->flush();
    }

    /**
     * Prevent global tables from being deleted when deleting a mu-site
     *
     * @param array $tables The tables to drop when deleting a mu-site.
     * @param int   $siteId The ID of the mu-site being deleted.
     *
     * @return array The tables to drop when deleting a mu-site, excluding the protected ones.
     */
    public function protectGlobalTables($tables, $siteId)
    {
        $protectedTables = [\'terms\', \'term_taxonomy\'];

        return array_filter($tables, function ($tableName) use ($protectedTables) {
            return !in_array($tableName, $protectedTables);
        }, ARRAY_FILTER_USE_KEY);
    }
}