laravel/laravel/loader.php

<?php namespace Laravel;

class Loader {

	/**
	 * The paths that will be searched by the loader.
	 *
	 * @var array
	 */
	public static $paths = array();

	/**
	 * The class aliases defined for the application.
	 *
	 * @var array
	 */
	public static $aliases = array();

	/**
	 * Load the file for a given class.
	 *
	 * @param  string  $class
	 * @return void
	 */
	public static function load($class)
	{
		// All Laravel core classes follow a namespace to directory convention. So, we will
		// replace all of the namespace slashes with directory slashes.
		$file = strtolower(str_replace('\\', '/', $class));

		// First, we'll check to determine if an alias exists. If it does, we will define the
		// alias and bail out. Aliases are defined for most developer used core classes.
		if (array_key_exists($class, static::$aliases)) return class_alias(static::$aliases[$class], $class);

		foreach (static::$paths as $path)
		{
			if (file_exists($path = $path.$file.EXT))
			{
				require_once $path;

				return;
			}
		}
	}

	/**
	 * Register a class alias with the auto-loader.
	 *
	 * Note: Aliases are lazy-loaded, so the aliased class will not be included until it is needed.
	 *
	 * @param  string  $alias
	 * @param  string  $class
	 * @return void
	 */
	public static function alias($alias, $class)
	{
		static::$aliases[$alias] = $class;
	}

	/**
	 * Register a path with the auto-loader.
	 *
	 * @param  string  $path
	 * @return void
	 */
	public static function path($path)
	{
		static::$paths[] = rtrim($path, '/').'/';
	}

	/**
	 * Remove an alias from the auto-loader's alias registrations.
	 *
	 * @param  string  $alias
	 * @return void
	 */
	public static function forget_alias($alias)
	{
		unset(static::$aliases[$alias]);
	}

}