Init

Author: Teemu Suoranta

index.php

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+<?php
+// Say nothing...

readme.md

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+# WP-CLI Term Merge
+
+**Contributors:** [Teemu Suoranta](https://github.com/TeemuSuoranta)
+
+**Tags:** WordPress, WP-CLI, Terms
+
+**License:** GPLv2 or later
+
+## Description
+
+Merge two terms into one. Move all posts from term A to term B and optionally delete term A after that.
+
+### How to use
+
+Basic (all post types, image size large):
+
+`wp term-merge run --from={term_id 1} --to={term_id 2}`
+`wp term-merge run --from=123 --to=321`
+
+Skip deleting the term:
+
+`wp term-merge run --from={term_id 1} --to={term_id 2} --skip-delete`
+
+### Output
+
+```
+$ wp term-merge run --from=123 --to=321
+Success: Done: 10 posts moved from #123 (Books) to #321 (Literary)
+Success: Deleted term #123 (Books)
+```
+
+## Disclaimer
+
+You should backup your database before running this just in case.

wp-cli-term-merge.php

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+<?php
+/*
+Plugin Name: WP-CLI Term Merge
+Plugin URI: https://github.com/aucor/wp-cli-term-merge
+Version: 1.0.0
+Author: Aucor Oy
+Author URI: https://github.com/aucor
+Description: Merge two terms into one
+License: GPLv2 or later
+License URI: http://www.gnu.org/licenses/gpl-2.0.html
+Text Domain: wp-cli-term-merge
+*/
+
+defined('ABSPATH') or die('Nope');
+
+if (defined('WP_CLI') && WP_CLI) {
+
+  class WP_CLI_Term_Merge {
+
+    protected $updated;
+    protected $ignored;
+
+    /**
+     * wp term-merge run --from=123 --to=321
+     * wp term-merge run --from=123 --to=321 --skip-delete
+     *
+     * --post_type=page
+     */
+    public function run($args = array(), $assoc_args = array()) {
+
+      if (!isset($assoc_args['from']) || !isset($assoc_args['to'])) {
+        WP_CLI::error('Missing required args "from" and "to"');
+      }
+
+      $from_term = get_term(absint($assoc_args['from']));
+      if (!($from_term instanceof WP_Term)) {
+        WP_CLI::error('Invalid term in "from"');
+      }
+
+      $to_term = get_term(absint($assoc_args['to']));
+      if (!($to_term instanceof WP_Term)) {
+        WP_CLI::error('Invalid term in "to"');
+      }
+
+      $skip_delete = false;
+      if (isset($assoc_args['skip-delete'])) {
+        $skip_delete = true;
+      }
+
+      $count = 0;
+
+      $query = new WP_Query([
+        'post_type'       => 'any',
+        'posts_per_page'  => -1,
+        'post_status'     => 'any',
+        'lang'            => '',
+        'tax_query'       => [
+          [
+            'taxonomy' => $from_term->taxonomy,
+            'field'    => 'term_id',
+            'terms'    => [$from_term->term_id],
+          ],
+        ],
+      ]);
+
+      while ($query->have_posts()) : $query->the_post();
+
+        // remove "from" term
+        $from_terms = wp_get_post_terms(get_the_ID(), $from_term->taxonomy);
+        $from_terms_ids = [];
+        foreach ($from_terms as $term) {
+          if ($term instanceof WP_Term && $term->term_id !== $from_term->term_id) {
+            $from_terms_ids[] = $term->term_id;
+          }
+        }
+        wp_set_post_terms(get_the_ID(), $from_terms_ids, $from_term->taxonomy, false);
+
+        // insert "to" term
+        $to_terms = wp_get_post_terms(get_the_ID(), $to_term->taxonomy);
+        $to_terms_ids = [];
+        foreach ($to_terms as $term) {
+          if ($term instanceof WP_Term) {
+            $to_terms_ids[] = $term->term_id;
+          }
+        }
+        $to_terms_ids[] = $to_term->term_id;
+        wp_set_post_terms(get_the_ID(), $to_terms_ids, $to_term->taxonomy, false);
+
+        // update count
+        $count++;
+
+      endwhile;
+
+      WP_CLI::success('Done: ' . $count . ' posts moved from #' . $from_term->term_id . ' (' . $from_term->name . ') to #' . $to_term->term_id . ' (' . $to_term->name . ')');
+
+      // delete "from" term
+      if (!$skip_delete) {
+        wp_delete_term($from_term->term_id, $from_term->taxonomy);
+        WP_CLI::success('Deleted term: #' . $from_term->term_id . ' (' . $from_term->name . ')');
+      }
+
+    }
+
+  }
+
+  WP_CLI::add_command('term-merge', 'WP_CLI_Term_Merge');
+
+}