WP CLI: list terms with the same name in a hierarchical taxonomy for sites in multisite network.

list-duplicate-terms-in-the-taxonomy.php

<?php
/**
* List terms (categories) with the same name for each of the blog with a sticker. 
* 
* This is a one-off, but could be easily abstracted to be more versatile.
* 
* @subcommand list-multiple-terms-with-the-same-name
* @synopsis [--taxonomy=<category>]
*/
	
function list_multiple_terms_with_the_same_name( $args, $assoc_args ) {
  $tax = $assoc_args['taxonomy'] ?? 'category';
  
  $current_blog_id = get_current_blog_id();
  // Can be list of blog ids in the network
  $blog_ids = [ $current_blog_id ];
  $ret = [];
  
  $get_function = function() {
    $categories = get_terms( $tax, [ 'hide_empty' => false, 'fields' => 'id=>name' ] );
    return array_unique( array_diff_assoc( $categories, array_unique( $categories ) ) );
  };
  
  
  WP_CLI::line( sprintf( 'Found %d blogs with "%s" sticker', count( $blog_ids ), $sticker ) );
  foreach( $blog_ids as $blog_id ) {
    switch_to_blog( $blog_id );
    $dupes = $get_function();
    if ( $dupes ) {
      $ret[ $blog_id ] = [ 
        'bloginfo' => [ 
          'name' => get_bloginfo( 'name' ),
          'url'  => get_bloginfo( 'url' ),
        ],
        'duplicateCategories' => array_map( function( $cat ) { return sprintf("%s : %s", $cat, esc_url_raw( admin_url( "edit-tags.php?taxonomy=category&post_type=post&s={$cat}" ) ) ); }, array_values( $dupes ) )
      ];					
    }
    $this->stop_the_insanity();
  }
  
  WP_CLI::line( sprintf( '%d blogs have categories with duplicate names', count( $ret ) ) );
  
  WP_CLI::line( wp_json_encode( $ret, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES ) );
  
  switch_to_blog( $current_blog_id );
}