Events manager - custom taxonomy and search filter

gistfile1.php

<?php
// custom host taxonomy for events
add_action( 'init', 'register_my_taxonomies', 0 );

function register_my_taxonomies() {
$labels = array(
    'name'                          => 'Hosts',
    'singular_name'                 => 'Host',
    'search_items'                  => 'Search hosts',
    'popular_items'                 => 'Popular hosts',
    'all_items'                     => 'All hosts',
    'parent_item'                   => 'Parent host',
    'edit_item'                     => 'Edit host',
    'update_item'                   => 'Update host',
    'add_new_item'                  => 'Add New host',
    'new_item_name'                 => 'New host',
    'separate_items_with_commas'    => 'Separate hosts with commas',
    'add_or_remove_items'           => 'Add or remove hosts',
    'choose_from_most_used'         => 'Choose from most used hosts'
    );

$args = array(
    'labels'                        => $labels,
    'public'                        => true,
    'hierarchical'                  => true,
    'show_ui'                       => true,
    'show_in_nav_menus'             => true,
    'args'                          => array( 'orderby' => 'term_order' ),
    'rewrite'                       => array( 'slug' => 'events/hosts', 'with_front' => false ),
    'query_var'                     => true
);

register_taxonomy( 'hosts', EM_POST_TYPE_EVENT, $args );
}

// custom taxonomy search and display
add_action('em_template_events_search_form_ddm', 'hosts_search_form');
function hosts_search_form(){
  $hosts = (is_array(get_option('hosts'))) ? get_option('hosts'):array();
	?>
	<!-- START hosts Search -->
	<select name="host" id="host_search">
		<option value="" selected="selected">Hosted by</option>
		<?php
		$taxonomies = array('hosts');
		$args = array('orderby'=>'count','hide_empty'=>false);
		echo get_terms_dropdown($taxonomies, $args);
		?>
	</select>
	<!-- END hosts Search -->
	<?php
}

function my_em_hosts_event_load($EM_Event){
	global $wpdb;
	$EM_Event->hosts = $wpdb->get_col("SELECT term_taxonomy_id FROM $wpdb->term_relationships WHERE object_id='{$EM_Event->post_id}'", 0);
     print_r($EM_Event->hosts);
}
add_action('em_event','my_em_hosts_event_load',1,1);

// And make the search attributes for the shortcode
add_filter('em_events_get_default_search','my_em_hosts_get_default_search',1,2);
function my_em_hosts_get_default_search($searches, $array){
	if( !empty($array['host']) ){
   // print_r($array['host']);
		$searches['host'] = $array['host'];
	}
	return $searches;
}

add_filter('em_events_get','my_em_hosts_events_get',1,2);
function my_em_hosts_events_get($events, $args){
	if( !empty($args['host'])  ){
		foreach($events as $event_key => $EM_Event){
			if( !in_array($args['host'],$EM_Event->hosts) ){
				unset($events[$event_key]);
			}
		}
	}
	return $events;
}

function get_terms_dropdown($taxonomies, $args){
	$myterms = get_terms($taxonomies, $args);

	foreach($myterms as $term){
		$root_url = get_bloginfo('url');
		$term_taxonomy=$term->taxonomy;
		$term_slug=$term->slug;
		$term_name =$term->name;
		$value = $term->term_id;
		$output .="<option value='".$value."'>".$term_name."</option>";
	}

return $output;
}
?>