ci之 core下CodeIgniter源码分析(1)
ci 执行流程
index.php 文件
加载codeigniter文件
codeigniter部分里面加载的：
-
加载配置文件constants
-
加载全局公共函数core/Common.php 文件
-
全局变量获取变量
-
判断是否composer加载程序(个人感觉 还是单个加载的方便)
使用刚才加载的common里面的函数load_class
- 加载 Benchmark基准测试类(这个类主要用来记录程序的执行时间、内存使用、cpu使用等情况)
- 加载 钩子类 扩展用 不改变当前的ci核心
- 加载 配置文件 默认的是你在index.php 里面 设置的config.php 文件,如果找不到则加载apppath的config.php
- 获取utf8的配置
- 加载一些函数
- 加载utf8字集处理
- 加载解析url
- 加载路由类 依赖上面的url来判断走向
- 加载输出类 ci的数据都靠这个了
- 加载安全类 xss crsf
- 加载input组件类
- 加载语言类
- 加载项目和框架的控制器
<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2017, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link https://codeigniter.com
* @since Version 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* 系统初始化类
*
* 加载基类并执行请求。
*
* @package CodeIgniter
* @subpackage CodeIgniter
* @category Front-controller
* @author EllisLab Dev Team
* @link https://codeigniter.com/user_guide/
*/
/**
* CodeIgniter 版本
*
* @var string
*
*/
const CI_VERSION = '3.1.5';
/*
* ------------------------------------------------------
* 加载框架常用配置文件
* ------------------------------------------------------
*/
if (file_exists(APPPATH.'config/'.ENVIRONMENT.'/constants.php'))
{
require_once(APPPATH.'config/'.ENVIRONMENT.'/constants.php');
}
if (file_exists(APPPATH.'config/constants.php'))
{
require_once(APPPATH.'config/constants.php');
}
/*
* ------------------------------------------------------
* 加载全局函数类
* ------------------------------------------------------
*/
require_once(BASEPATH.'core/Common.php');
/*
* ------------------------------------------------------
* 安全程序
* ------------------------------------------------------
*/
if ( ! is_php('5.4'))
{
ini_set('magic_quotes_runtime', 0); //是否自动加上转义的字符 已经被放弃了
//on true off false 使用全局变量
if ((bool) ini_get('register_globals')) //获取php的环境变量 register_globals设置控制PHP变量访问范围
{
$_protected = array(
'_SERVER',
'_GET',
'_POST',
'_FILES',
'_REQUEST',
'_SESSION',
'_ENV',
'_COOKIE',
'GLOBALS',
'HTTP_RAW_POST_DATA',
'system_path',
'application_folder',
'view_folder',
'_protected',
'_registered'
);
$_registered = ini_get('variables_order'); //接收环境变量 是否开启
foreach (array('E' => '_ENV', 'G' => '_GET', 'P' => '_POST', 'C' => '_COOKIE', 'S' => '_SERVER') as $key => $superglobal)
{
if (strpos($_registered, $key) === FALSE)
{
continue;
}
foreach (array_keys($$superglobal) as $var)
{
if (isset($GLOBALS[$var]) && ! in_array($var, $_protected, TRUE))
{
$GLOBALS[$var] = NULL;
}
}
}
}
}
/*
* ------------------------------------------------------
* Define a custom error handler so we can log PHP errors
* 定义自定义错误处理程序，以便记录PHP错误
* ------------------------------------------------------
*/
set_error_handler('_error_handler'); //设置用户自定义错误函数
set_exception_handler('_exception_handler'); //设置用户自定义错误异常函数
register_shutdown_function('_shutdown_handler'); // php中止执行的函数
/*
* ------------------------------------------------------
* Set the subclass_prefix
* 设置子类的前戳
* ------------------------------------------------------
*
* 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
* overridden 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' => $assign_to_config['subclass_prefix']));
}
/*
* ------------------------------------------------------
* 使用composer加载程序
* ------------------------------------------------------
*/
if ($composer_autoload = config_item('composer_autoload'))
{
if ($composer_autoload === TRUE)
{
file_exists(APPPATH.'vendor/autoload.php')
? require_once(APPPATH.'vendor/autoload.php')
: log_message('error', '$config[\'composer_autoload\'] is set to TRUE but '.APPPATH.'vendor/autoload.php was not found.');
}
elseif (file_exists($composer_autoload))
{
require_once($composer_autoload);
}
else
{
log_message('error', 'Could not find the specified $config[\'composer_autoload\'] path: '.$composer_autoload);
}
}
/*
* ------------------------------------------------------
* Start the timer... tick tock tick tock...
* 计时器
* ------------------------------------------------------
*/
$BM =& load_class('Benchmark', 'core'); // & 引用返回用在当想用函数找到引用应该被绑定在哪一个变量上面时
$BM->mark('total_execution_time_start');
$BM->mark('loading_time:_base_classes_start');
/*
* ------------------------------------------------------
* 实例化钩子类
* ------------------------------------------------------
*/
$EXT =& load_class('Hooks', 'core');
/*
* ------------------------------------------------------
* Is there a "pre_system" hook?
* 是否有 pre_system钩子类加载
* ------------------------------------------------------
*/
$EXT->call_hook('pre_system'); //pre_system 系统加载早期执行 这个阶段只有 钩子类和基准测试类加载 其他还没加载
/*
* ------------------------------------------------------
* 实例化配置类
* ------------------------------------------------------
*
* Note: It is important that Config is loaded first as
* most other classes depend on it either directly or by
* depending on another class that uses it.
*
*/
$CFG =& load_class('Config', 'core');
// 在加载的时候index.php文件中是否有手动的配置
if (isset($assign_to_config) && is_array($assign_to_config))
{
foreach ($assign_to_config as $key => $value)
{
$CFG->set_item($key, $value);
}
}
/*
* ------------------------------------------------------
* 字符集相关的配置
* ------------------------------------------------------
*
* Configure mbstring and/or iconv if they are enabled
* and set MB_ENABLED and ICONV_ENABLED constants, so
* that we don't repeatedly do extension_loaded() or
* function_exists() calls.
*
* Note: UTF-8 class depends on this. It used to be done
* in it's constructor, but it's _not_ class-specific.
*
*/
$charset = strtoupper(config_item('charset'));
ini_set('default_charset', $charset);
if (extension_loaded('mbstring'))
{
define('MB_ENABLED', TRUE);
// mbstring.internal_encoding is deprecated starting with PHP 5.6
// and it's usage triggers E_DEPRECATED messages.
@ini_set('mbstring.internal_encoding', $charset);
// This is required for mb_convert_encoding() to strip invalid characters.
// That's utilized by CI_Utf8, but it's also done for consistency with iconv.
mb_substitute_character('none');
}
else
{
define('MB_ENABLED', FALSE);
}
// There's an ICONV_IMPL constant, but the PHP manual says that using
// iconv's predefined constants is "strongly discouraged".
if (extension_loaded('iconv'))
{
define('ICONV_ENABLED', TRUE);
// iconv.internal_encoding is deprecated starting with PHP 5.6
// and it's usage triggers E_DEPRECATED messages.
@ini_set('iconv.internal_encoding', $charset);
}
else
{
define('ICONV_ENABLED', FALSE);
}
if (is_php('5.6'))
{
ini_set('php.internal_encoding', $charset);
}
/*
* ------------------------------------------------------
* 加载一些定义的东东函数
* ------------------------------------------------------
*/
require_once(BASEPATH.'core/compat/mbstring.php');
require_once(BASEPATH.'core/compat/hash.php');
require_once(BASEPATH.'core/compat/password.php');
require_once(BASEPATH.'core/compat/standard.php');
/*
* ------------------------------------------------------
* 实例化utf8类
* ------------------------------------------------------
*/
$UNI =& load_class('Utf8', 'core');
/*
* ------------------------------------------------------
* 实例化url类
* ------------------------------------------------------
*/
$URI =& load_class('URI', 'core');
/*
* ------------------------------------------------------
* 实例化路由类并设置路由
* ------------------------------------------------------
*/
$RTR =& load_class('Router', 'core', isset($routing) ? $routing : NULL);
/*
* ------------------------------------------------------
* 实例化输出类
* ------------------------------------------------------
*/
$OUT =& load_class('Output', 'core');
/*
* ------------------------------------------------------
* 是否有效的缓存文件
* ------------------------------------------------------
*/
if ($EXT->call_hook('cache_override') === FALSE && $OUT->_display_cache($CFG, $URI) === TRUE)
{
exit;
}
/*
* -----------------------------------------------------
* 加载安全类
* -----------------------------------------------------
*/
$SEC =& load_class('Security', 'core');
/*
* ------------------------------------------------------
* 加载input组件类
* ------------------------------------------------------
*/
$IN =& load_class('Input', 'core');
/*
* ------------------------------------------------------
* 加载语言类
* ------------------------------------------------------
*/
$LANG =& load_class('Lang', 'core');
/*
* ------------------------------------------------------
* 加载项目和框架的控制器
* ------------------------------------------------------
*
*/
// Load the base controller class
require_once BASEPATH.'core/Controller.php';
/**
* Reference to the CI_Controller method.
*
* Returns current CI instance object
*
* @return CI_Controller
*/
function &get_instance()
{
return CI_Controller::get_instance();
}
if (file_exists(APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php'))
{
require_once APPPATH.'core/'.$CFG->config['subclass_prefix'].'Controller.php';
}
if (file_exists(APPPATH.'core/Rest_Controller.php'))
{
require_once APPPATH.'core/Rest_Controller.php';
}
// Set a mark point for benchmarking
$BM->mark('loading_time:_base_classes_end');
/*
* ------------------------------------------------------
* Sanity checks
* ------------------------------------------------------
*
* The Router class has already validated the request,
* leaving us with 3 options here:
*
* 1) an empty class name, if we reached the default
* controller, but it didn't exist;
* 2) a query string which doesn't go through a
* file_exists() check
* 3) a regular request for a non-existing page
*
* We handle all of these as a 404 error.
*
* Furthermore, 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.
*/
$e404 = FALSE;
$class = ucfirst($RTR->class);
$method = $RTR->method;
var_dump(method_exists($class, '_remap'));
exit;
if (empty($class) OR ! file_exists(APPPATH.'controllers/'.$RTR->directory.$class.'.php'))
{
$e404 = TRUE;
}
else
{
require_once(APPPATH.'controllers/'.$RTR->directory.$class.'.php');
if ( ! class_exists($class, FALSE) OR $method[0] === '_' OR method_exists('CI_Controller', $method))
{
$e404 = TRUE;
}
elseif (method_exists($class, '_remap'))
{
$params = array($method, array_slice($URI->rsegments, 2));
$method = '_remap';
}
elseif ( ! method_exists($class, $method))
{
$e404 = TRUE;
}
/**
* DO NOT CHANGE THIS, NOTHING ELSE WORKS!
*
* - method_exists() returns true for non-public methods, which passes the previous elseif
* - is_callable() returns false for PHP 4-style constructors, even if there's a __construct()
* - method_exists($class, '__construct') won't work because CI_Controller::__construct() is inherited
* - People will only complain if this doesn't work, even though it is documented that it shouldn't.
*
* ReflectionMethod::isConstructor() is the ONLY reliable check,
* knowing which method will be executed as a constructor.
*/
elseif ( ! is_callable(array($class, $method)))
{
$reflection = new ReflectionMethod($class, $method);
if ( ! $reflection->isPublic() OR $reflection->isConstructor())
{
$e404 = TRUE;
}
}
}
if ($e404)
{
if ( ! empty($RTR->routes['404_override']))
{
if (sscanf($RTR->routes['404_override'], '%[^/]/%s', $error_class, $error_method) !== 2)
{
$error_method = 'index';
}
$error_class = ucfirst($error_class);
if ( ! class_exists($error_class, FALSE))
{
if (file_exists(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php'))
{
require_once(APPPATH.'controllers/'.$RTR->directory.$error_class.'.php');
$e404 = ! class_exists($error_class, FALSE);
}
// Were we in a directory? If so, check for a global override
elseif ( ! empty($RTR->directory) && file_exists(APPPATH.'controllers/'.$error_class.'.php'))
{
require_once(APPPATH.'controllers/'.$error_class.'.php');
if (($e404 = ! class_exists($error_class, FALSE)) === FALSE)
{
$RTR->directory = '';
}
}
}
else
{
$e404 = FALSE;
}
}
// Did we reset the $e404 flag? If so, set the rsegments, starting from index 1
if ( ! $e404)
{
$class = $error_class;
$method = $error_method;
$URI->rsegments = array(
1 => $class,
2 => $method
);
}
else
{
show_404($RTR->directory.$class.'/'.$method);
}
}
if ($method !== '_remap')
{
$params = array_slice($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');
