[Closed] Need help to set existing category after update secondary languge posts by API call

<?php
/*
Plugin Name: Master Control Dashboard (Full Sender)
Description: Secure post updater — WPML-friendly, preserves translated categories, tags, featured image, etc.
Version: 2.1
*/

// ---------------------------
// 1️⃣ Configuration
// ---------------------------
$site_secret_key = 'RERasean@!34AsDfGhJkLzX000';
$master_key      = 'MASTER_SECRET_';

// ---------------------------
// 2️⃣ Security Checks
// ---------------------------
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    die('Invalid request method');
}

$data = json_decode(file_get_contents('<em><u>hidden link</u></em>'), true);
if (!$data) die('Invalid JSON data');

if (empty($data['site_key']) || $data['site_key'] !== $site_secret_key) {
    die('Unauthorized: site key');
}

if (empty($data['master_key']) || $data['master_key'] !== $master_key) {
    die('Unauthorized: master key');
}

if (empty($data['slug'])) {
    die('Missing slug');
}

// ---------------------------
// 3️⃣ Load WordPress
// ---------------------------
require_once __DIR__ . '/wp-load.php';

// ---------------------------
// 4️⃣ Get the post by slug
// ---------------------------
$slug = sanitize_text_field($data['slug']);

$post = get_posts([
    'name'        => $slug,
    'post_type'   => 'post',
    'post_status' => ['publish', 'draft'],
    'numberposts' => 1,
]);

if (!$post) die('Post not found');

$post_id = $post[0]->ID;

// ---------------------------
// 5️⃣ BACKUP OLD TAXONOMIES (WPML-AWARE)
// ---------------------------
$old_tags = wp_get_post_terms($post_id, 'post_tag', ['fields' => 'names']);
$old_cats = [];

$categories = wp_get_post_terms($post_id, 'category');
foreach ($categories as $term) {
    if (defined('ICL_SITEPRESS_VERSION') && function_exists('apply_filters')) {
        $term_lang = apply_filters('wpml_element_language_code', null, [
            'element_id'   => $term->term_id,
            'element_type' => 'tax_category',
        ]);
    } else {
        $term_lang = ''; // no WPML
    }

    $old_cats[] = [
        'id'   => $term->term_id,
        'lang' => $term_lang,
    ];
}

// ---------------------------
// 6️⃣ UPDATE POST CONTENT
// ---------------------------
$update = ['ID' => $post_id];

if (!empty($data['new_title'])) {
    $update['post_title'] = sanitize_text_field($data['new_title']);
}

if (!empty($data['new_slug'])) {
    $update['post_name'] = sanitize_title($data['new_slug']);
}

if (!empty($data['content'])) {
    $update['post_content'] = wp_kses_post($data['content']);
}

if (!empty($data['excerpt'])) {
    $update['post_excerpt'] = sanitize_text_field($data['excerpt']);
}

wp_update_post($update);

// ---------------------------
// 7️⃣ RESTORE CATEGORIES (LANGUAGE-AWARE)
// ---------------------------
if (!empty($old_cats)) {
    $translated_cats = [];

    if (defined('ICL_SITEPRESS_VERSION') && function_exists('apply_filters')) {
        // get post language
        $post_lang = apply_filters('wpml_element_language_code', null, [
            'element_id'   => $post_id,
            'element_type' => 'post_post',
        ]);

        foreach ($old_cats as $cat) {
            // find equivalent category in current language
            $mapped_id = apply_filters('wpml_object_id', $cat['id'], 'category', false, $post_lang);
            if ($mapped_id) {
                $translated_cats[] = (int) $mapped_id;
            }
        }
    } else {
        // no WPML installed
        foreach ($old_cats as $cat) {
            $translated_cats[] = (int) $cat['id'];
        }
    }

    if (!empty($translated_cats)) {
        wp_set_post_terms($post_id, $translated_cats, 'category', false);
    }
}

// ---------------------------
// 8️⃣ UPDATE TAGS (REPLACE OR RESTORE)
// ---------------------------
if (!empty($data['tags']) && is_array($data['tags'])) {
    $new_tags = array_map('sanitize_text_field', $data['tags']);
    wp_set_post_terms($post_id, $new_tags, 'post_tag', false);
} else {
    if (!empty($old_tags)) {
        wp_set_post_terms($post_id, $old_tags, 'post_tag', false);
    }
}

// ---------------------------
// 9️⃣ HANDLE FEATURED IMAGE
// ---------------------------
if (!empty($data['featured_image'])) {
    $image_url = esc_url_raw($data['featured_image']);
    $caption   = !empty($data['caption']) ? sanitize_text_field($data['caption']) : '';

    require_once ABSPATH . 'wp-admin/includes/media.php';
    require_once ABSPATH . 'wp-admin/includes/file.php';
    require_once ABSPATH . 'wp-admin/includes/image.php';

    $image_id = media_sideload_image($image_url, $post_id, $caption, 'id');

    if (!is_wp_error($image_id)) {
        set_post_thumbnail($post_id, $image_id);

        if ($caption) {
            wp_update_post([
                'ID'           => $image_id,
                'post_excerpt' => $caption,
            ]);
        }
    }
}

// ---------------------------
// ✅ DONE
// ---------------------------
echo "✅ Post ID {$post_id} updated successfully (WPML-safe: title, slug, content, tags, categories, image)";