PHP Paging System

<?php

class Page {
    private $page; //global page variable

    //constructor recieves requested page from
    //the index via get ?page=
    public function __construct($page_) {
      $this->page = $page_; //assign passed page to global variable
      $this->pageExists($this->page); //pass page for verification
    }

    //check if page exists and if it does
    //pull the content from it
    private function pageExists() {
      if(file_exists("./pages/$this->page.php")) {
        //file exists and can be loaded
        echo file_get_contents("./pages/$this->page.php");
      } else {
        //page does not exist
        //TODO: Create a 404 page to redirect to
        echo "Warning: Page $this->page was not found!";
      }
    }
}
?>