SEO Hack: Dynamic Meta Keywords.php

<?php
function gaurav_custom_meta_keywords() {
    $keywords = ''; // Initialize keywords variable

    if (is_singular('post')) {
        // For singular posts, get the terms
        $post_id = get_the_ID();
        $terms_array = array(); // Initialize terms array

        // Get terms from categories, tags, and custom taxonomies
        $categories = get_the_category($post_id);
        $tags = get_the_tags($post_id);
        $custom_taxonomies = get_the_terms($post_id, 'deal_type'); // Replace with your custom taxonomy name

        // Add category names to the terms array
        if (!empty($categories)) {
            foreach ($categories as $category) {
                $terms_array[] = $category->name;
            }
        }

        // Add tag names to the terms array
        if (!empty($tags)) {
            foreach ($tags as $tag) {
                $terms_array[] = $tag->name;
            }
        }

        // Add custom taxonomy names to the terms array
        if (!empty($custom_taxonomies)) {
            foreach ($custom_taxonomies as $taxonomy) {
                $terms_array[] = $taxonomy->name;
            }
        }

        // Convert terms array into a string
        $keywords = implode(', ', $terms_array);
    } elseif (is_front_page() || is_page()) {
        // For the homepage and other pages, set a predefined list of keywords
        $keywords = 'blogger, developer, WordPress, designer, development, freelancer, SEO, entrepreneur';
    } elseif (is_tax()) {
        // For taxonomy pages, get the taxonomy and its children if any
        $term = get_queried_object();
        $children = get_term_children($term->term_id, $term->taxonomy);
        
        $keywords = $term->name; // Start with the current taxonomy name

        if (!empty($children)) {
            foreach ($children as $child_id) {
                $child = get_term_by('id', $child_id, $term->taxonomy);
                $keywords .= ', ' . $child->name;
            }
        }
    }

    // Output the meta keywords tag if keywords are set
    if (!empty($keywords)) {
        echo '<meta name="keywords" content="' . esc_attr($keywords) . '">' . "\n";
    }
}

add_action('wp_head', 'gaurav_custom_meta_keywords', 3);