index.php

<?php
	define('ENVIRONMENT', 'development');	//模式 development,testing,production
	$system_path = 'system';	//系统目录
	$application_folder = 'web';	//项目目录
	// $routing['directory'] = '';
	// $routing['controller'] = '';
	// $routing['function']	= '';
	// $assign_to_config['name_of_config_item'] = 'value of config item';
	
	//ERROR REPORTING
	if (defined('ENVIRONMENT')){
		switch (ENVIRONMENT){
			case 'development':
				error_reporting(E_ALL);
			break;
			case 'testing':
			case 'production':
				error_reporting(0);
			break;
			default:
				exit('The application environment is not set correctly.');
		}
	}
	// Set the current directory correctly for CLI requests
	if (defined('STDIN')){
		chdir(dirname(__FILE__));
	}
	if (realpath($system_path) !== FALSE){
		$system_path = realpath($system_path).'/';
	}
	// ensure there's a trailing slash
	$system_path = rtrim($system_path, '/').'/';
	// Is the system path correct?
	if ( ! is_dir($system_path)){
		exit("Your system folder path does not appear to be set correctly. Please open the following file and correct this: ".pathinfo(__FILE__, PATHINFO_BASENAME));
	}

/*
 * -------------------------------------------------------------------
 *  Now that we know the path, set the main path constants
 * -------------------------------------------------------------------
 */
	define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));
	define('EXT', '.php');
	define('BASEPATH', str_replace("\\", "/", $system_path));
	define('FCPATH', str_replace(SELF, '', __FILE__));
	define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/'));
	// The path to the "application" folder
	if (is_dir($application_folder)){
		define('APPPATH', $application_folder.'/');
	}else{
		if ( ! is_dir(BASEPATH.$application_folder.'/')){
			exit("Your application folder path does not appear to be set correctly. Please open the following file and correct this: ".SELF);
		}
		define('APPPATH', BASEPATH.$application_folder.'/');
	}

require_once BASEPATH.'core/CodeIgniter.php';
?>