system/core/CodeIgniter.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2010, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

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

/*
 * ------------------------------------------------------
 *  Define the CodeIgniter Version
 * ------------------------------------------------------
 */
	define('CI_VERSION', '2.0');

/*
 * ------------------------------------------------------
 *  Load the global functions
 * ------------------------------------------------------
 */
	require(BASEPATH.'core/Common'.EXT);

/*
 * ------------------------------------------------------
 *  Load the compatibility override functions
 * ------------------------------------------------------
 */
	require(BASEPATH.'core/Compat'.EXT);

/*
 * ------------------------------------------------------
 *  Load the framework constants
 * ------------------------------------------------------
 */
	require(APPPATH.'config/constants'.EXT);

/*
 * ------------------------------------------------------
 *  Define a custom error handler so we can log PHP errors
 * ------------------------------------------------------
 */
	set_error_handler('_exception_handler');
	
	if ( ! is_php('5.3'))
	{
		@set_magic_quotes_runtime(0); // Kill magic quotes		
	}

	// Set a liberal script execution time limit
	if (function_exists("set_time_limit") == TRUE AND @ini_get("safe_mode") == 0)
	{
		@set_time_limit(300);
	}

/*
 * ------------------------------------------------------
 *  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 (isset($assign_to_config['subclass_prefix']) AND $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))
	{	
		$CFG->_assign_to_config($assign_to_config);
	}

/*
 * ------------------------------------------------------
 *  Instantiate the Unicode class
 * ------------------------------------------------------
 * 
 * Note: Order here is rather important as the Unicode
 * 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('Unicode', 'core');
		
/*
 * ------------------------------------------------------
 *  Instantiate the URI class
 * ------------------------------------------------------
 */
	$URI =& load_class('URI', 'core');

/*
 * ------------------------------------------------------
 *  Instantiate the routing class and set the routing
 * ------------------------------------------------------
 */ 
	$RTR =& load_class('Router', 'core');
	$RTR->_set_routing();
	
	// 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 ($EXT->_call_hook('cache_override') === FALSE)
	{
		if ($OUT->_display_cache($CFG, $URI) == TRUE)
		{
			exit;
		}
	}

/*
 * ------------------------------------------------------
 *  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
 * ------------------------------------------------------
 *
 *  Note: Due to the poor object handling in PHP 4 we'll
 *  conditionally load different versions of the base
 *  class.  Retaining PHP 4 compatibility requires a bit of a hack.
 *  @PHP4
 * 
 */
 	if (is_php('5.0.0') == TRUE)
	{
		require(BASEPATH.'core/Base5'.EXT);
	}
	else
	{
		// The Loader class needs to be included first when running PHP 4.x
		load_class('Loader', 'core');
		require(BASEPATH.'core/Base4'.EXT);
	}
	
	// Load the base controller class
	require BASEPATH.'core/Controller'.EXT;
	
	if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller'.EXT))
	{
		require APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller'.EXT;
	}
	
	// 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.
	if ( ! file_exists(APPPATH.'controllers/'.$RTR->fetch_directory().$RTR->fetch_class().EXT))
	{
		show_error('Unable to load your default controller.  Please make sure the controller specified in your Routes.php file is valid.');
	}
	
	include(APPPATH.'controllers/'.$RTR->fetch_directory().$RTR->fetch_class().EXT);
	
	// Set a mark point for benchmarking
	$BM->mark('loading_time:_base_classes_end');

/*
 * ------------------------------------------------------
 *  Security check
 * ------------------------------------------------------
 *
 *  None of the functions in the app controller or the
 *  loader class can be called via the URI, nor can
 *  controller functions that begin with an underscore
 */
	$class  = $RTR->fetch_class();
	$method = $RTR->fetch_method();
	
	if ( ! class_exists($class)
		OR $method == 'controller'
		OR strncmp($method, '_', 1) == 0
		OR in_array(strtolower($method), array_map('strtolower', get_class_methods('Controller')))
		)
	{
		show_404("{$class}/{$method}");
	}

/*
 * ------------------------------------------------------
 *  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
 * ------------------------------------------------------
 */
	// Is there a "remap" function? If so, we call it instead
	if (method_exists($CI, '_remap'))
	{
		$CI->_remap($method);
	}
	else
	{
		// is_callable() returns TRUE on some versions of PHP 5 for private and protected
		// methods, so we'll use this workaround for consistent behavior
		if ( ! in_array(strtolower($method), array_map('strtolower', get_class_methods($CI))))
		{
			show_404("{$class}/{$method}");
		}

		// Call the requested method.
		// Any URI segments present (besides the class/function) will be passed to the method for convenience		
		call_user_func_array(array(&$CI, $method), array_slice($URI->rsegments, 2));		
	}

	
	// 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');

/*
 * ------------------------------------------------------
 *  Close the DB connection if one exists
 * ------------------------------------------------------
 */
	if (class_exists('CI_DB') AND isset($CI->db))
	{
		$CI->db->close();
	}


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