Page.php

<?php	// UTF-8 marker äöüÄÖÜß€
/**
 * Class Page for the exercises of the EWA lecture
 * Demonstrates use of PHP including class and OO.
 * Implements Zend coding standards.
 * Generate documentation with Doxygen or phpdoc
 *
 * PHP Version 5
 *
 * @category File
 * @package  Pizzaservice
 * @author   Bernhard Kreling, <b.kreling@fbi.h-da.de>
 * @author   Ralf Hahn, <ralf.hahn@h-da.de>
 * @license  http://www.h-da.de  none
 * @Release  1.2
 * @link     http://www.fbi.h-da.de
 */

// require_once 'index.php';
require_once './blocks/Navigation.php';

/**
 * This abstract class is a common base class for all
 * HTML-pages to be created.
 * It manages access to the database and provides operations
 * for outputting header and footer of a page.
 * Specific pages have to inherit from that class.
 * Each inherited class can use these operations for accessing the db
 * and for creating the generic parts of a HTML-page.
 *
 * @author   Bernhard Kreling, <b.kreling@fbi.h-da.de>
 * @author   Ralf Hahn, <ralf.hahn@h-da.de>
 */
abstract class Page
{
    // --- ATTRIBUTES ---

        /**
     * @var Navigation
     */
    private $_navigation;
    /**
     * Reference to the MySQLi-Database that is
     * accessed by all operations of the class.
     */
    protected $_database = null;

    // --- OPERATIONS ---

    /**
     * Connects to DB and stores
     * the connection in member $_database.
     * Needs name of DB, user, password.
     *
     * @return none
     */

    protected function __construct()
    {
        $this->_database = Page::createDb();
        $this->_navigation = new Navigation($this->_database);
        session_start();
    }

    private static function createDb()
    {
        $mysqli = mysqli_connect("localhost", "root", "", "pizzaservice") or die($link);
        // $hostname = "localhost";
        // $username = "root";
        // $password = "";
        // $database = "pizzaservice";
        // $mysqli = new mysqli($hostname, $username, $password, $database);
        $mysqli->set_charset("utf8");
        if ($mysqli->connect_errno) {
            throw new Exception("error while connecting to database - ErrorCode: " . $mysqli->connect_errno);
        }
        return $mysqli;
    }

    /**
     * Closes the DB connection and cleans up
     *
     * @return none
     */
    protected function __destruct()
    {
        $this->_database->close();
    }

    /**
     * Generates the header section of the page.
     * i.e. starting from the content type up to the body-tag.
     * Takes care that all strings passed from outside
     * are converted to safe HTML by htmlspecialchars.
     *
     * @param $headline $headline is the text to be used as title of the page
     *
     * @return none
     */
    protected function generatePageHeader($headline, $scripts)
    {
        $headline = htmlspecialchars($headline);
        header("Content-type: text/html; charset=UTF-8");

        $headline = htmlspecialchars($headline);
        header("Content-type: text/html; charset=UTF-8");

        $s = "";
        foreach($scripts as $key => $values){
            foreach($values as $value){
                if ($key == "css"){
                    $s .= "<link rel='stylesheet' type='text/css' href='$value'/>\n";
                }else if($key == "js"){
                    $s .= "<script src='$value' type='application/javascript'></script>\n";
                }else if($key == "custom"){
                    $s .= $value . "\n";
                }
            }
        }

      
        return <<<EOT
        <!DOCTYPE html>
        <html><head>
        $s
      
EOT;
}

    /**
     * Outputs navigationbar
     *
     * @return none
     */

    protected function generateNavigation(){
        $this->_navigation->generateView();
    }
     /**
     * Outputs the end of the HTML-file i.e. /body etc.
     *
     * @return none
     */
    protected function generatePageFooter()
    {
        return <<<EOT
      
        </body>
        </html>
EOT;
    }

    /**
     * Processes the data that comes via GET or POST i.e. CGI.
     * If every page is supposed to do something with submitted
     * data do it here. E.g. checking the settings of PHP that
     * influence passing the parameters (e.g. magic_quotes).
     *
     * @return none
     */
    protected function processReceivedData()
    {
        if (get_magic_quotes_gpc()) {
            throw new Exception
                ("Bitte schalten Sie magic_quotes_gpc in php.ini aus!");
        }
    }
} // end of class

// Zend standard does not like closing php-tag!
// PHP doesn't require the closing tag (it is assumed when the file ends).
// Not specifying the closing ? >  helps to prevent accidents
// like additional whitespace which will cause session
// initialization to fail ("headers already sent").
//? >