creating shortcode to group location by region

function em_location_by_region(){
 $args = array();
 $arr_location = EM_Locations::get($args);


 /*Get regions as header*/
 $arr_region = array();
 foreach ( $arr_location as $EM_Location_region ) {
  if ( !in_array($EM_Location_region->region,$arr_region) && !empty($EM_Location_region->region) ){
   array_push($arr_region,$EM_Location_region->region);
  }
 }

 /*Get state*/
 $arr_state = array();
 $arr_region_state = array();
 foreach ( $arr_region as $key => $value ) {
  foreach ( $arr_location as $EM_Location_state ) {
   if ( $EM_Location_state->region == $value ){
     array_push($arr_state,'<a href="'.$EM_Location_state->get_permalink().'">'.$EM_Location_state->name.'</a>');
   }
  }
  $arr_region_state[$value] = $arr_state;
  if ( !empty($arr_state) )$arr_state = array();
 }
 ksort($arr_region_state);
 /*display the result*/
 foreach ( $arr_region_state as $key => $value ) {
  echo '<h2>'.$key.'</h2>';
  echo '<ul>';
  foreach ( $value as $em_state ) {
    echo '<li>'.$em_state.'</li>';
  }
  echo '</ul>';
 }

}
add_shortcode('location_group', 'em_location_by_region');