Add Taxonomy to URL

tax_in_url.php

// Custom Taxonomy Permalinks -- This will use the Taxonomy Variable as part of the URL dynamically
// You will need to add the %variable% from line 10 in your post type like this
// 'rewrite' => array('slug' => '/%variable%', 'with_front' => false)
// or if you're using Toolset then turn on permalink rewrite and add /%variable% as the custom rewrite

add_filter('post_link', 'location_permalink', 10, 3); // Call it what you want
add_filter('post_type_link', 'location_permalink', 10, 3); // Call it what you want
 
function location_permalink($permalink, $post_id, $leavename) { // Make sure your name matches the filter name above
        if (strpos($permalink, '%state%') === FALSE) return $permalink; // The variable you add to your rewrite URL, here we are using %state%
 
        // Get post
        $post = get_post($post_id);
        if (!$post) return $permalink;
 
        // Get taxonomy terms
        $terms = wp_get_object_terms($post->ID, 'state'); // Change 'state' to your tax slug, like 'flower'
        if (!is_wp_error($terms) && !empty($terms) && is_object($terms[0])) $taxonomy_slug = $terms[0]->slug;
        else $taxonomy_slug = 'unknown'; // Change 'unknown' to what you want to output when nothing is selected
 
        return str_replace('%state%', $taxonomy_slug, $permalink); // Change the variable here too
}