WordPress: Output Taxonomy Slugs

output-taxonomy-slugs.php

<?php
/**
        * Output Taxonomy Slugs
        * http://wordpress.org/support/topic/output-taxonomy-slugs
*/
// function my_dropdown($name, $taxonomy = 'category') {
// $defaults = array(
//     'taxonomy' => $taxonomy,
//     'id'       => $name,
//     'name'     => $name,
//     'show_option_none' => ' - Select - ',
//     'selected' => get_query_var($name)
// );

// wp_dropdown_categories($defaults);
//  }

add_action('pre_get_posts', 'my_customsearch');
function my_customsearch($query) {

    if(! $query->is_main_query() || ! $query->is_search )
       return;

    $tax_query = array();
    $software_category = (int) get_query_var('software-categories');
    $software_platform = (int) get_query_var('software-platform');
    $software_audience = (int) get_query_var('software-audience');

    // first dropdown
    if (! empty($software_category) && $software_category > 0) {
       $tax_query[] = array(
         'taxonomy' => 'software-categories',
         'field'    => 'slug',
         'terms'    => $software_category
       );
    }

    // second dropdown
    if (! empty($software_platform) && $software_platform > 0) {
       $tax_query[] = array(
         'taxonomy' => 'software-platform',
         'field'    => 'slug',
         'terms'    => $software_platform
       );
    }

    // third dropdown
    if (! empty($software_audience) && $software_audience > 0) {
       $tax_query[] = array(
         'taxonomy' => 'software-audience',
         'field'    => 'slug',
         'terms'    => $software_audience
       );
    }

   if ( sizeof($tax_query) > 0 ) {
      $tax_query['relation'] = 'AND';
      $query->set( 'tax_query', $tax_query );
   }

}

// add my custom query vars
add_filter('query_vars', 'mycustom_query_vars');

function mycustom_query_vars($query_vars) {
  $query_vars[] = 'software_category';
  $query_vars[] = 'software_platform';
  $query_vars[] = 'software_audience';

  return $query_vars;
 }

?>