system/core/CodeIgniter.php

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.2.4 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2013, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * System Initialization File
 *
 * Loads the base classes and executes the request.
 *
 * @package		CodeIgniter
 * @subpackage	CodeIgniter
 * @category	Front-controller
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/
 */

/**
 * CodeIgniter Version
 *
 * @var	string
 *
 */
	define('CI_VERSION', '3.0-dev');
	
/*
 * ------------------------------------------------------
 *  Load the framework constants
 * ------------------------------------------------------
 */
	if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants.php'))
	{
		require(APPPATH.'config/'.ENVIRONMENT.'/constants.php');
	}
	else
	{
		require(APPPATH.'config/constants.php');
	}

/*
 * ------------------------------------------------------
 *  Load the global functions
 * ------------------------------------------------------
 */
	require_once(BASEPATH.'core/Common.php');

/*
 * ------------------------------------------------------
 *  Define a custom error handler so we can log PHP errors
 * ------------------------------------------------------
 */
	set_error_handler('_exception_handler');
	register_shutdown_function('_shutdown_handler');

	// Kill magic quotes
	is_php('5.4') OR @ini_set('magic_quotes_runtime', 0);

/*
 * ------------------------------------------------------
 *  Set the subclass_prefix
 * ------------------------------------------------------
 *
 * Normally the "subclass_prefix" is set in the config file.
 * The subclass prefix allows CI to know if a core class is
 * being extended via a library in the local application
 * "libraries" folder. Since CI allows config items to be
 * overriden via data set in the main index.php file,
 * before proceeding we need to know if a subclass_prefix
 * override exists. If so, we will set this value now,
 * before any classes are loaded
 * Note: Since the config file data is cached it doesn't
 * hurt to load it here.
 */
	if ( ! empty($assign_to_config['subclass_prefix']))
	{
		get_config(array('subclass_prefix' => $assign_to_config['subclass_prefix']));
	}

/*
 * ------------------------------------------------------
 *  Start the timer... tick tock tick tock...
 * ------------------------------------------------------
 */
	$BM =& load_class('Benchmark', 'core');
	$BM->mark('total_execution_time_start');
	$BM->mark('loading_time:_base_classes_start');

/*
 * ------------------------------------------------------
 *  Instantiate the hooks class
 * ------------------------------------------------------
 */
	$EXT =& load_class('Hooks', 'core');

/*
 * ------------------------------------------------------
 *  Is there a "pre_system" hook?
 * ------------------------------------------------------
 */
	$EXT->call_hook('pre_system');

/*
 * ------------------------------------------------------
 *  Instantiate the config class
 * ------------------------------------------------------
 */
	$CFG =& load_class('Config', 'core');

	// Do we have any manually set config items in the index.php file?
	if (isset($assign_to_config) && is_array($assign_to_config))
	{
		foreach ($assign_to_config as $key => $value)
		{
			$CFG->set_item($key, $value);
		}
	}

/*
 * ------------------------------------------------------
 *  Instantiate the UTF-8 class
 * ------------------------------------------------------
 *
 * Note: Order here is rather important as the UTF-8
 * class needs to be used very early on, but it cannot
 * properly determine if UTF-8 can be supported until
 * after the Config class is instantiated.
 *
 */
	$UNI =& load_class('Utf8', 'core');

/*
 * ------------------------------------------------------
 *  Instantiate the URI class
 * ------------------------------------------------------
 */
	$URI =& load_class('URI', 'core');

/*
 * ------------------------------------------------------
 *  Instantiate the routing class and set the routing
 * ------------------------------------------------------
 */
	$RTR =& load_class('Router', 'core');

	// Set any routing overrides that may exist in the main index file
	if (isset($routing))
	{
		$RTR->_set_overrides($routing);
	}

/*
 * ------------------------------------------------------
 *  Instantiate the output class
 * ------------------------------------------------------
 */
	$OUT =& load_class('Output', 'core');

/*
 * ------------------------------------------------------
 *	Is there a valid cache file? If so, we're done...
 * ------------------------------------------------------
 */
	if ($EXT->call_hook('cache_override') === FALSE
		&& $OUT->_display_cache($CFG, $URI) === TRUE)
	{
		exit;
	}

/*
 * -----------------------------------------------------
 * Load the security class for xss and csrf support
 * -----------------------------------------------------
 */
	$SEC =& load_class('Security', 'core');

/*
 * ------------------------------------------------------
 *  Load the Input class and sanitize globals
 * ------------------------------------------------------
 */
	$IN	=& load_class('Input', 'core');

/*
 * ------------------------------------------------------
 *  Load the Language class
 * ------------------------------------------------------
 */
	$LANG =& load_class('Lang', 'core');

/*
 * ------------------------------------------------------
 *  Load the app controller and local controller
 * ------------------------------------------------------
 *
 */
	// Load the base controller class
	require BASEPATH.'core/Controller.php';

	/**
	 * Reference to the CI_Controller method.
	 *
	 * Returns current CI instance object
	 *
	 * @return object
	 */
	function &get_instance()
	{
		return CI_Controller::get_instance();
	}

	if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php'))
	{
		require APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php';
	}

	// Load the local application controller
	// Note: The Router class automatically validates the controller path using the router->_validate_request().
	// If this include fails it means that the default controller in the Routes.php file is not resolving to something valid.
	$class = ucfirst($RTR->class);
	if ( ! file_exists(APPPATH.'controllers/'.$RTR->directory.$class.'.php'))
	{
		show_error('Unable to load your default controller. Please make sure the controller specified in your Routes.php file is valid.');
	}

	include(APPPATH.'controllers/'.$RTR->directory.$class.'.php');

	// Set a mark point for benchmarking
	$BM->mark('loading_time:_base_classes_end');

/*
 * ------------------------------------------------------
 *  Security check
 * ------------------------------------------------------
 *
 *  None of the methods in the app controller or the
 *  loader class can be called via the URI, nor can
 *  controller methods that begin with an underscore.
 */
	$method	= $RTR->method;

	if ( ! class_exists($class, FALSE) OR $method[0] === '_' OR method_exists('CI_Controller', $method))
	{
		if ( ! empty($RTR->routes['404_override']))
		{
			if (sscanf($RTR->routes['404_override'], '%[^/]/%s', $class, $method) !== 2)
			{
				$method = 'index';
			}

			$class = ucfirst($class);

			if ( ! class_exists($class, FALSE))
			{
				if ( ! file_exists(APPPATH.'controllers/'.$class.'.php'))
				{
					show_404($class.'/'.$method);
				}

				include_once(APPPATH.'controllers/'.$class.'.php');
			}
		}
		else
		{
			show_404($class.'/'.$method);
		}
	}

	if (method_exists($class, '_remap'))
	{
		$params = array($method, array_slice($URI->rsegments, 2));
		$method = '_remap';
	}
	else
	{
		// WARNING: It appears that there are issues with is_callable() even in PHP 5.2!
		// Furthermore, there are bug reports and feature/change requests related to it
		// that make it unreliable to use in this context. Please, DO NOT change this
		// work-around until a better alternative is available.
		if ( ! in_array(strtolower($method), array_map('strtolower', get_class_methods($class)), TRUE))
		{
			if (empty($RTR->routes['404_override']))
			{
				show_404($class.'/'.$method);
			}
			elseif (sscanf($RTR->routes['404_override'], '%[^/]/%s', $class, $method) !== 2)
			{
				$method = 'index';
			}

			$class = ucfirst($class);

			if ( ! class_exists($class, FALSE))
			{
				if ( ! file_exists(APPPATH.'controllers/'.$class.'.php'))
				{
					show_404($class.'/'.$method);
				}

				include_once(APPPATH.'controllers/'.$class.'.php');
			}
		}

		$params = array_slice($URI->rsegments, 2);
	}

/*
 * ------------------------------------------------------
 *  Is there a "pre_controller" hook?
 * ------------------------------------------------------
 */
	$EXT->call_hook('pre_controller');

/*
 * ------------------------------------------------------
 *  Instantiate the requested controller
 * ------------------------------------------------------
 */
	// Mark a start point so we can benchmark the controller
	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_start');

	$CI = new $class();

/*
 * ------------------------------------------------------
 *  Is there a "post_controller_constructor" hook?
 * ------------------------------------------------------
 */
	$EXT->call_hook('post_controller_constructor');

/*
 * ------------------------------------------------------
 *  Call the requested method
 * ------------------------------------------------------
 */
	call_user_func_array(array(&$CI, $method), $params);

	// Mark a benchmark end point
	$BM->mark('controller_execution_time_( '.$class.' / '.$method.' )_end');

/*
 * ------------------------------------------------------
 *  Is there a "post_controller" hook?
 * ------------------------------------------------------
 */
	$EXT->call_hook('post_controller');

/*
 * ------------------------------------------------------
 *  Send the final rendered output to the browser
 * ------------------------------------------------------
 */
	if ($EXT->call_hook('display_override') === FALSE)
	{
		$OUT->_display();
	}

/*
 * ------------------------------------------------------
 *  Is there a "post_system" hook?
 * ------------------------------------------------------
 */
	$EXT->call_hook('post_system');

/* End of file CodeIgniter.php */
/* Location: ./system/core/CodeIgniter.php */