shops/application/controllers/controller_get_rayons.php

<?php
class Controller_Get_Rayons extends Controller
{
	function __construct()
    {
    $this->model = new Model_Get_Rayons();
	}
	
	function action_index()
    {	
		$data = $this->model->get_shops($_POST['city']);		
		echo '<select id="rayon_select">';
		echo '<option value="0">Район</option>';
		foreach($data as $row){
			echo '<option value="'.$row['rayon'].'">'.$row['rayon'].'</option>';
		}
		echo '</select>';
    }
}
?>