Help with Understanding Namespaces

[NomadicJosh]

I want to convert my MVC framework to conform to the PSR-0 standards, but I am having a devil of a time trying to wrap my head around namespaces and how it works. I am using the suggested SplClassLoader class. Below is my file structure, and what I am trying to accomplish.

 

index.php

application

system

      --Classes

              --Autoloader.php

              --Extension.php

      --config

              --helper.php

 

index.php:

defined( 'DS' )				or define( 'DS', DIRECTORY_SEPARATOR );
defined( 'BASE_PATH' )			or define( 'BASE_PATH', dirname(realpath(__FILE__)) . DS );
defined( 'APP_FOLDER' )			or define( 'APP_FOLDER', 'application' );
defined( 'APP_PATH' )			or define( 'APP_PATH', BASE_PATH . APP_FOLDER . DS );
defined( 'SYS_PATH' )			or define( 'SYS_PATH', BASE_PATH . 'system' . DS );
defined( 'LOCALE_DIR' ) 		or define( 'LOCALE_DIR', BASE_PATH . 'locale' );
defined( 'DEFAULT_LOCALE' )		or define( 'DEFAULT_LOCALE', '');
defined( 'ENCODING' )			or define( 'ENCODING', 'UTF-8');
defined( 'CURRENT_VERSION' )	        or define( 'CURRENT_VERSION', '0.3');

require( SYS_PATH . 'config/constants.php');
require( SYS_PATH . 'application.php');
require( SYS_PATH . 'Classes/Autoloader.php');

use Classes\Autoloader;
$classLoader = new Autoloader('Classes', BASE_PATH . 'system');
$classLoader->register();

$app = new Bootstrap();

 

Extension.php:

<?php if ( ! defined('BASE_PATH')) exit('No direct script access allowed');

namespace Classes;

class Extension {

        public __construct() {
             echo 'This Extension class is working';
        }

}

 

helper.php

<?php if ( ! defined('BASE_PATH')) exit('No direct script access allowed');

use Classes\Extension as Ext;
$apphelp = new Ext();
$apphelp->helper(array('gettext'));

 

The helper.php file is automatically loaded through a registry.php file, so there are no issues there. Now that all that is place, I am getting the following error:

Fatal error: Class 'Classes\Extension' not found in /Applications/MAMP/htdocs/framework/system/config/helper.php on line 21

 

I can't figure out what I am doing wrong. Like I said, I am still trying to understand namespaces, but I thought I was making progress, but I've been struggling with this for two days now. I know that "namespace" is supposed to come first in the code, and I did make that change even though it doesn't look so above, but I still receive errors. Any help is greatly appreciated.

[ManiacDan]

Are you using include() or require() to pull in the file?  I don't see it

[NomadicJosh]

It's in the autoloader class near the bottom:

 

<?php

/**
* SplClassLoader implementation that implements the technical interoperability
* standards for PHP 5.3 namespaces and class names.
*
* http://groups.google.com/group/php-standards/web/final-proposal
*
*     // Example which loads classes for the Doctrine Common package in the
*     // Doctrine\Common namespace.
*     $classLoader = new SplClassLoader('Doctrine\Common', '/path/to/doctrine');
*     $classLoader->register();
*
* @author Jonathan H. Wage <[email protected]>
* @author Roman S. Borschel <[email protected]>
* @author Matthew Weier O'Phinney <[email protected]>
* @author Kris Wallsmith <[email protected]>
* @author Fabien Potencier <[email protected]>
*/
class SplClassLoader
{
    private $_fileExtension = '.php';
    private $_namespace;
    private $_includePath;
    private $_namespaceSeparator = '\\';

    /**
     * Creates a new <tt>SplClassLoader</tt> that loads classes of the
     * specified namespace.
     * 
     * @param string $ns The namespace to use.
     */
    public function __construct($ns = null, $includePath = null)
    {
        $this->_namespace = $ns;
        $this->_includePath = $includePath;
    }

    /**
     * Sets the namespace separator used by classes in the namespace of this class loader.
     * 
     * @param string $sep The separator to use.
     */
    public function setNamespaceSeparator($sep)
    {
        $this->_namespaceSeparator = $sep;
    }

    /**
     * Gets the namespace seperator used by classes in the namespace of this class loader.
     *
     * @return void
     */
    public function getNamespaceSeparator()
    {
        return $this->_namespaceSeparator;
    }

    /**
     * Sets the base include path for all class files in the namespace of this class loader.
     * 
     * @param string $includePath
     */
    public function setIncludePath($includePath)
    {
        $this->_includePath = $includePath;
    }

    /**
     * Gets the base include path for all class files in the namespace of this class loader.
     *
     * @return string $includePath
     */
    public function getIncludePath()
    {
        return $this->_includePath;
    }

    /**
     * Sets the file extension of class files in the namespace of this class loader.
     * 
     * @param string $fileExtension
     */
    public function setFileExtension($fileExtension)
    {
        $this->_fileExtension = $fileExtension;
    }

    /**
     * Gets the file extension of class files in the namespace of this class loader.
     *
     * @return string $fileExtension
     */
    public function getFileExtension()
    {
        return $this->_fileExtension;
    }

    /**
     * Installs this class loader on the SPL autoload stack.
     */
    public function register()
    {
        spl_autoload_register(array($this, 'loadClass'));
    }

    /**
     * Uninstalls this class loader from the SPL autoloader stack.
     */
    public function unregister()
    {
        spl_autoload_unregister(array($this, 'loadClass'));
    }

    /**
     * Loads the given class or interface.
     *
     * @param string $className The name of the class to load.
     * @return void
     */
    public function loadClass($className)
    {
        if (null === $this->_namespace || $this->_namespace.$this->_namespaceSeparator === substr($className, 0, strlen($this->_namespace.$this->_namespaceSeparator))) {
            $fileName = '';
            $namespace = '';
            if (false !== ($lastNsPos = strripos($className, $this->_namespaceSeparator))) {
                $namespace = substr($className, 0, $lastNsPos);
                $className = substr($className, $lastNsPos + 1);
                $fileName = str_replace($this->_namespaceSeparator, DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
            }
            $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . $this->_fileExtension;

            require ($this->_includePath !== null ? $this->_includePath . DIRECTORY_SEPARATOR : '') . $fileName;
        }
    }
}