Error sending array of inputs

2 comments

1. As I said in a comment above, setting query_var => false for the custom taxonomy is not a solution because this will make term pages in frontend return a 404 error. Renounce to term pages in the frontend to make a simple form to work is far away to be a solution.

   Finally I’ve solved the problem. Instead of set the name in the select element to ‘my_tax[]’, I’ve set it to something like ‘tax_input[‘my_tax’][]. Don’t ask me why WordPress needs this, but it fix the problem.

   Just if someone needs an example.

   My sample taxonomies:

   $taxonomies = array(
               'type'               => array('label' => 'Types','slug' => 'type','hierarchical' => false,'multiple' => false),
               'city'               => array('label' => 'Cities','slug' => 'city','hierarchical' => true,'multiple' => false),
               'community_features' => array('label' => 'Community features','slug' => 'community_features','hierarchical' => false,'multiple' => true),
               'property_features'  => array('label' => 'Property features','slug' => 'property_features','hierarchical' => false,'multiple' => true)
       ); 
   
      foreach($taxonomies as $taxonomy => $properties){
           register_taxonomy(
                            $taxonomy,
                            'properties',
                            array(
                                 'label'        => __( $properties['label'] ),
                                 'hierarchical' => $properties['hierarchical'],
                                 'query_var'    => true,
                                 )
                             );
   
            register_taxonomy_for_object_type( $taxonomy, 'properties' );
   
   }
   

   Here a sample form:

              <form method="post" action="<?php echo get_post_type_archive_link('properties');?>">
                <?php
                  foreach($taxonomies as $taxonomy) {
                      $args = array(
                                   'show_option_all'    => __('Select '.$taxonomy['label'],'properties'),
                                   'orderby'            => 'NAME', 
                                   'order'              => 'ASC',
                                   'hide_empty'         => 0, 
                                   'echo'               => 0,
                                   'selected'           => '',
                                   'hierarchical'       => true, 
                                   'name'               => 'tax_input['.$taxonomy['slug'].'][]',
                                   'class'              => '',
                                   'taxonomy'           => $taxonomy['slug'],
                                );
   
                    if($taxonomy['multiple']){
                      $args['show_option_all'] = '';
                    }
                    $select = wp_dropdown_categories( $args );
   
                    if($taxonomy['multiple']){
                      $select = preg_replace("#<select([^>]*)>#", "<select$1 multiple>", $select);
                    }
   
                    echo $select;
                  }
                ?>
                <input type="hidden" name="action" id="action" value="search">
                <button type="submit"><?php _e('Search','properties');?></button>
              </form>
   

   Added a custom query var:

   add_filter('query_vars', 'properties_add_query_vars');
   function properties_add_query_vars( $vars) {
      $vars[] = "action"; // name of the var as seen in the URL
      return $vars;
   }
   

   An my sample pre_get_posts:

   add_action( 'pre_get_posts', 'properties_pre_get_post' );
   function properties_pre_get_post($query){
   
     if(isset($query->query_vars['action']) && $query->query_vars['action'] == 'search'){
   
        if($query->is_main_query() && !is_admin() && $query->is_archive ) {
   
           $tax_query = array();
   
           $tax_input = $_POST['tax_input'];
           if(!empty($tax_input)){
   
              foreach($tax_input as $key => $value){
                 if(array_key_exists($key, $taxonomies)){
                    if(!empty($value) && $value[0] != "0"){
                       $value = array_map('intval', $value);
                   $tax_query[] = array(
                                            'taxonomy' => $key,
                                            'field'    => 'id',
                                            'terms'    => $value,
                                            'operator' => 'AND'
                                      );
                    }
                 }
               }
            $query->set('tax_query',$tax_query);
          }
       }
     }
   }
   

2. solved with; query_var => false

   register_taxonomy('taxname', 'post_type', array('hierarchical' => true, 'label' => 'lable',     'query_var' => false, 'rewrite' => array('slug' => 'slug')));
   

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