feadulta/wordpress/migrate_authors.php

<?php
/**
 * Migrar metadatos Autor (que es un user_id) a categorias
 */
require_once('/var/www/html/wp-load.php');

echo "=== Migrando AUTORES a categorias ===\n\n";

$users = $wpdb->get_results("SELECT ID, display_name FROM wp_users WHERE ID > 1");

$created = 0;
$assigned = 0;

foreach ($users as $user) {
    $user_id = $user->ID;
    $name = $user->display_name;
    
    if (empty($name)) continue;
    
    // Crear categoria
    $term = get_term_by('name', $name, 'category');
    if (!$term) {
        $result = wp_insert_term($name, 'category', array(
            'slug' => sanitize_title($name),
            'description' => 'Autor: ' . $name
        ));
        if (is_wp_error($result)) {
            echo "Error: $name\n";
            continue;
        }
        $term_id = $result['term_id'];
        $created++;
    } else {
        $term_id = $term->term_id;
    }
    
    // Buscar posts con este autor (meta_value = user_id)
    $posts = $wpdb->get_col($wpdb->prepare("
        SELECT DISTINCT pm.post_id 
        FROM wp_postmeta pm
        JOIN wp_posts p ON pm.post_id = p.ID
        WHERE pm.meta_key = 'Autor' AND pm.meta_value = %s
        AND p.post_type = 'post' AND p.post_status = 'publish'
    ", $user_id));
    
    foreach ($posts as $post_id) {
        wp_set_object_terms($post_id, $term_id, 'category', true);
        $assigned++;
    }
    
    if (count($posts) > 0) {
        echo "$name: " . count($posts) . " posts\n";
    }
}

echo "\nCategorias creadas: $created\n";
echo "Asignaciones: $assigned\n";
echo "=== FIN ===\n";