CI框架源码入口文件index.php即程序开始执行的地方
index.php 在CI的解压目录下的，和system文件夹并列
<?php
//定义ENVIRONMENT，system_path，application_folder
//根据system_path，application_folder，定义常量BASEPATH，APPPATH，SELF, EXT， FCPATH，SYSDIR
*---------------------------------------------------------------
* APPLICATION ENVIRONMENT
*---------------------------------------------------------------
*
* You can load different configurations depending on your
* current environment. Setting the environment also influences
* things like logging and error reporting.
*
* This can be set to anything, but default usage is:
*
* development
* testing
* production
*
* NOTE: If you change these, also change the error_reporting() code below
*
*/
//ENVIRONMENT 决定是否报错
define('ENVIRONMENT', 'development');
/*
*---------------------------------------------------------------
* ERROR REPORTING
*---------------------------------------------------------------
*
* Different environments will require different levels of error reporting.
* By default development will show errors but testing and live will hide them.
*/
if (defined('ENVIRONMENT'))
{
switch (ENVIRONMENT)
{
case 'development':
//E_ALL :所有错误都报
error_reporting(E_ALL);
break;
case 'testing':
case 'production':
error_reporting(0);
break;
default:
exit('The application environment is not set correctly.');
}
}
//system文件夹的名字，谁没事儿改它啊
/*
*---------------------------------------------------------------
* SYSTEM FOLDER NAME
*---------------------------------------------------------------
*
* This variable must contain the name of your "system" folder.
* Include the path if the folder is not in the same directory
* as this file.
*
*/
$system_path = 'system';
//寻找哪个文件夹里的controller
// 没有后斜杠！！
/*
*---------------------------------------------------------------
* APPLICATION FOLDER NAME
*---------------------------------------------------------------
*
* If you want this front controller to use a different "application"
* folder then the default one you can set its name here. The folder
* can also be renamed or relocated anywhere on your server. If
* you do, use a full server path. For more info please see the user guide:
* http://codeigniter.com/user_guide/general/managing_apps.html
*
* NO TRAILING SLASH!
*
*/
$application_folder = 'application/mysjjy';
//system/core/router.php
/*
* --------------------------------------------------------------------
* DEFAULT CONTROLLER
* --------------------------------------------------------------------
*
* Normally you will set your default controller in the routes.php file.
* You can, however, force a custom routing by hard-coding a
* specific controller class/function here. For most applications, you
* WILL NOT set your routing here, but it's an option for those
* special instances where you might want to override the standard
* routing in a specific front controller that shares a common CI installation.
*
* IMPORTANT: If you set the routing here, NO OTHER controller will be
* callable. In essence, this preference limits your application to ONE
* specific controller. Leave the function name blank if you need
* to call functions dynamically via the URI.
*
* Un-comment the $routing array below to use this feature
*
*/
// The directory name, relative to the "controllers" folder. Leave blank
// if your controller is not in a sub-folder within the "controllers" folder
// $routing['directory'] = '';
// The controller class file name. Example: Mycontroller
// $routing['controller'] = '';
// The controller function you wish to be called.
// $routing['function'] = '';
/*
* -------------------------------------------------------------------
* CUSTOM CONFIG VALUES
* -------------------------------------------------------------------
*
* The $assign_to_config array below will be passed dynamically to the
* config class when initialized. This allows you to set custom config
* items or override any default config values found in the config.php file.
* This can be handy as it permits you to share one application between
* multiple front controller files, with each file containing different
* config values.
*
* Un-comment the $assign_to_config array below to use this feature
*
*/
// $assign_to_config['name_of_config_item'] = 'value of config item';
// --------------------------------------------------------------------
// END OF USER CONFIGURABLE SETTINGS. DO NOT EDIT BELOW THIS LINE
// --------------------------------------------------------------------
/*
* ---------------------------------------------------------------
* Resolve the system path for increased reliability
* ---------------------------------------------------------------
*/
// Set the current directory correctly for CLI requests
if (defined('STDIN'))
{
chdir(dirname(__FILE__));
}
if (realpath($system_path) !== FALSE)
{
$system_path = realpath($system_path).'/';
}
//确保system的末端带有/
// ensure there's a trailing slash
$system_path = rtrim($system_path, '/').'/';
//如果system path不是一个dir,报错！
// 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
* -------------------------------------------------------------------
*/
//pathinfo 路径分解
//SELF index.php
// The name of THIS file
define('SELF', pathinfo(__FILE__, PATHINFO_BASENAME));
//扩展名
// The PHP file extension
// this global constant is deprecated.
define('EXT', '.php');
//定义BASEPATH 为system_path
// Path to the system folder
define('BASEPATH', str_replace("\\", "/", $system_path));
//将index.php去掉
// Path to the front controller (this file)
define('FCPATH', str_replace(SELF, '', __FILE__));
// Name of the "system folder"
define('SYSDIR', trim(strrchr(trim(BASEPATH, '/'), '/'), '/'));
//定义APPPATH 为$application_folder.'/'
// The path to the "application" folder
//is_dir($filename) 如果 filename 是一个相对路径，则按照当前工作目录检查其相对路径
//即index.php所在目录下没有application_folder，就找system下有没有，定义为APPPATH
if (is_dir($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.'/');
}
/*
* --------------------------------------------------------------------
* LOAD THE BOOTSTRAP FILE
* --------------------------------------------------------------------
*
* And away we go...
*
*/
//引用system/core/CodeIgniter.php
require_once BASEPATH.'core/CodeIgniter.php';
/* End of file index.php */
/* Location: ./index.php */
本文标题：CI框架源码入口文件index.php即程序开始执行的地方
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