Internal server error new object php

Question

Here is my code. I do not know why creating new object name site create an error. also the name of the file for my object is the same as the class name site.php.

<?php
class site {
    var $is_container_enabled = 1; 
    function init() {
        $this->container_tpl = "common/common";
    }
    function handle_page($page) {
        $this->cache_id = $page;
        $this->smarty->caching = 0;
        switch ($page) {
            case "static" :
                $type=$_REQUEST['choice'];
                $this->default_tpl = "static/$type";
                break;

            default :
                $this->is_container_enabled = isset($_REQUEST['ce'])?$_REQUEST['ce']:1;
                $this->default_tpl = $page.'/home';
                break;
        }
    }
    function is_container_enabled(){
        return $this->is_container_enabled;
    }
    function set_container_enabled($ce){
        $this->is_container_enabled = $ce;
    }
    function get_container_tpl(){
        return $this->container_tpl;
    }
}
    

some index.php that call the object site

  echo "before site declaration";
    $site = new site; // cause error
    echo "after site declaration";
            
    $site->init();
    $smarty = getSmarty();
    $site->smarty= &$smarty;
    $site->cache_id= &$cache_id;

Result in the browser image

And here is also Console error image

Answer 1

include 'site.php';
echo "before site declaration";
$site = new site; // You can access member variables/functions with this
echo "after site declaration";

$site->init();
$smarty = getSmarty();
$site->smarty= &$smarty;
$site->cache_id= &$cache_id;

Try this