Loading namespaced classes with Symfony 1.4's autoloader?

How to register namespaces (with PHP 5.3) in the Symfony 1.4 for t开发者_StackOverflow社区he autoloader class feature (like the Symfony 2.0)?

You can use Autoloader from Symfony2 in Symfony 1.4 framework.

1. Copy Symfony2 classloaders to vendor directory of your Symfony 1.4 sandbox project:

SF_ROOT_DIR/lib/vendor/Symfony2/src/Symfony/Component/ClassLoader/UniversalClassLoader.php

SF_ROOT_DIR/lib/vendor/Symfony2/src/Symfony/Component/ClassLoader/ApcUniversalClassLoader.php

2. Modify your SF_ROOT_DIR/config/ProjectConfiguration.class.php file as follows:

require_once dirname(__FILE__) . '/../lib/vendor/symfony/lib/autoload/sfCoreAutoload.class.php';
require_once dirname(__FILE__) . '/../lib/autoload/sfClassLoader.class.php';
sfCoreAutoload::register();

class ProjectConfiguration extends sfProjectConfiguration {

    public function setup() {
        $this->namespacesClassLoader();
        $this->enablePlugins('sfDoctrinePlugin');
    }

    public function namespacesClassLoader() {
       if (extension_loaded('apc')) {
           $loader = new ApcUniversalClassLoader('S2A');
       } else {
           $loader = new UniversalClassLoader();
       }
       $loader->registerNamespaces(array(
          'Pohon' => __DIR__ . '/../lib/vendor/Pohon/src'));
       $loader->register();
    }

}

3. Register desired namespaces:
eg. I want to load class:

Pohon\Tools\String\Utils\Slugify.

Filename must be:

SF_ROOT_DIR/lib/vendor/Pohon/src/Pohon/Tools/String/Utils/Slugify.php

and registered namespace as follows:

Pohon => SF_ROOT_DIR/lib/vendor/Pohon/src

You can use Composer and it's very easy. Just install it on your machine (you probably have already since it's 2015 now) and run in your project folder:

composer init 

You can then install all the packages you want with composer and include just this line in your ProjectConfiguration.class.php:

require_once __DIR__.'/../vendor/autoload.php';

Note that paths may differ if you changed the default Symfony1.4 directory structure.

Symfony uses the spl_autoload_register() function to register its own autoloader (sfAutoload).

You can register your own handler in the initialize() function of your Project/Application/Plugin. (whichever applies).

This is, for example, also what the Swift_Mailer plugin does: it registers its own autoloader when needed.