discuz代码阅读-核心类-class_core.php

<?php

/**

*      [Discuz!] (C)2001-2099 Comsenz Inc.

*      This is NOT a freeware, use is subject to license terms

*

*      $Id: class_core.php 31312 2012-08-10 03:33:54Z zhangguosheng $

*/

/*

error_reporting() 设置 PHP 的报错级别并返回当前级别。

*/

error_reporting(E_ALL);

/*

定义一个IN_DISCUZ为真，这个IN_DISCUZ常量的作用就是在其他inc这样的包含文件中防止被非法引用，一旦没有这个常量的话就出现Access Denied这样的字样然后退出。

*/

define('IN_DISCUZ', true);

/*

读取社区程序所在绝对路径，存放于常量 DISCUZ_ROOT 中。

*/

define('DISCUZ_ROOT', substr(dirname(__FILE__), 0, -12));

define('DISCUZ_CORE_DEBUG', false);

define('DISCUZ_TABLE_EXTENDABLE', TRUE);

/*

用户自定义未捕获异常处理函数为core类中的handleException方法函数

*/

set_exception_handler(array('core', 'handleException'));

if(DISCUZ_CORE_DEBUG) {

set_error_handler(array('core', 'handleError'));

register_shutdown_function(array('core', 'handleShutdown'));

}

if(function_exists('spl_autoload_register')) {

spl_autoload_register(array('core', 'autoload'));

} else {

function __autoload($class) {

return core::autoload($class);

}

}

C::creatapp();

class core

{

private static $_tables;

private static $_imports;

private static $_app;

private static $_memory;

/*

通过静态方法调用，返回静态方法所属类的成员对象

	*/

public static function app() {

return self::$_app;

}

/*

实例化对象$_app，将discuz_application实例化赋值给$_app,discuz_application实例化非常重要，全局变量$_G,就是在这里初始化的，创建 discuz_application 实例：进行核心的初始化操作，主要有加载配置文件、加载环境变量、连接数据库、加载setting信息、初始化用户数据、session的初始、计划任务等

	*/

public static function creatapp() {

if(!is_object(self::$_app)) {

self::$_app = discuz_application::instance();

}

return self::$_app;

}

/*

通过 C::t 方法来调用数据层对应表的对象来实现对数据的操作

	*/

public static function t($name) {

return self::_make_obj($name, 'table', DISCUZ_TABLE_EXTENDABLE);

}

/*

modle 模型

	*/

public static function m($name) {

$args = array();

if(func_num_args() > 1) {

$args = func_get_args();

unset($args[0]);

}

return self::_make_obj($name, 'model', true, $args);

}

/*

创建模型对象

	*/

protected static function _make_obj($name, $type, $extendable = true, $p = array()) {

$pluginid = null;

if($name[0] === '#') {

list(, $pluginid, $name) = explode('#', $name);

}

$cname = $type.'_'.$name;

if(!isset(self::$_tables[$cname])) {

if(!class_exists($cname, false)) {

self::import(($pluginid ? 'plugin/'.$pluginid : 'class').'/'.$type.'/'.$name);

}

if($extendable) {

self::$_tables[$cname] = new discuz_container();

switch (count($p)) {

case 0:	self::$_tables[$cname]->obj = new $cname();break;

case 1:	self::$_tables[$cname]->obj = new $cname($p[1]);break;

case 2:	self::$_tables[$cname]->obj = new $cname($p[1], $p[2]);break;

case 3:	self::$_tables[$cname]->obj = new $cname($p[1], $p[2], $p[3]);break;

case 4:	self::$_tables[$cname]->obj = new $cname($p[1], $p[2], $p[3], $p[4]);break;

case 5:	self::$_tables[$cname]->obj = new $cname($p[1], $p[2], $p[3], $p[4], $p[5]);break;

default: $ref = new ReflectionClass($cname);self::$_tables[$cname]->obj = $ref->newInstanceArgs($p);unset($ref);break;

}

} else {

self::$_tables[$cname] = new $cname();

}

}

return self::$_tables[$cname];

}

/*

初始化缓存

	*/

public static function memory() {

if(!self::$_memory) {

self::$_memory = new discuz_memory();

self::$_memory->init(self::app()->config['memory']);

}

return self::$_memory;

}

/*

类文件引入函数，autoload使用该函数

	*/

public static function import($name, $folder = '', $force = true) {

$key = $folder.$name;

if(!isset(self::$_imports[$key])) {

$path = DISCUZ_ROOT.'/source/'.$folder;

if(strpos($name, '/') !== false) {

$pre = basename(dirname($name));

$filename = dirname($name).'/'.$pre.'_'.basename($name).'.php';

} else {

$filename = $name.'.php';

}

if(is_file($path.'/'.$filename)) {

self::$_imports[$key] = true;

$rt = include $path.'/'.$filename;

return $rt;

} elseif(!$force) {

return false;

} else {

throw new Exception('Oops! System file lost: '.$filename);

}

}

return true;

}

/*

异常处理

	*/

public static function handleException($exception) {

discuz_error::exception_error($exception);

}

/*

error处理

	*/

public static function handleError($errno, $errstr, $errfile, $errline) {

if($errno & DISCUZ_CORE_DEBUG) {

discuz_error::system_error($errstr, false, true, false);

}

}

/*

关闭处理

	*/

public static function handleShutdown() {

if(($error = error_get_last()) && $error['type'] & DISCUZ_CORE_DEBUG) {

discuz_error::system_error($error['message'], false, true, false);

}

}

/*

自动加载类的方法

	*/

public static function autoload($class) {

$class = strtolower($class);

if(strpos($class, '_') !== false) {

list($folder) = explode('_', $class);

$file = 'class/'.$folder.'/'.substr($class, strlen($folder) + 1);

} else {

$file = 'class/'.$class;

}

try {

self::import($file);

	return true;

} catch (Exception $exc) {

$trace = $exc->getTrace();

foreach ($trace as $log) {

if(empty($log['class']) && $log['function'] == 'class_exists') {

	return false;

}

}

discuz_error::exception_error($exc);

}

}

public static function analysisStart($name){

$key = 'other';

if($name[0] === '#') {

list(, $key, $name) = explode('#', $name);

}

if(!isset($_ENV['analysis'])) {

$_ENV['analysis'] = array();

}

if(!isset($_ENV['analysis'][$key])) {

$_ENV['analysis'][$key] = array();

$_ENV['analysis'][$key]['sum'] = 0;

}

$_ENV['analysis'][$key][$name]['start'] = microtime(TRUE);

$_ENV['analysis'][$key][$name]['start_memory_get_usage'] = memory_get_usage();

$_ENV['analysis'][$key][$name]['start_memory_get_real_usage'] = memory_get_usage(true);

$_ENV['analysis'][$key][$name]['start_memory_get_peak_usage'] = memory_get_peak_usage();

$_ENV['analysis'][$key][$name]['start_memory_get_peak_real_usage'] = memory_get_peak_usage(true);

}

public static function analysisStop($name) {

$key = 'other';

if($name[0] === '#') {

list(, $key, $name) = explode('#', $name);

}

if(isset($_ENV['analysis'][$key][$name]['start'])) {

			$diff = round((microtime(TRUE) - $_ENV['analysis'][$key][$name]['start'])* 1000, 5);

$_ENV['analysis'][$key][$name]['time'] = $diff;

$_ENV['analysis'][$key]['sum'] = $_ENV['analysis'][$key]['sum'] + $diff;

unset($_ENV['analysis'][$key][$name]['start']);

$_ENV['analysis'][$key][$name]['stop_memory_get_usage'] = memory_get_usage();

$_ENV['analysis'][$key][$name]['stop_memory_get_real_usage'] = memory_get_usage(true);

$_ENV['analysis'][$key][$name]['stop_memory_get_peak_usage'] = memory_get_peak_usage();

$_ENV['analysis'][$key][$name]['stop_memory_get_peak_real_usage'] = memory_get_peak_usage(true);

}

return $_ENV['analysis'][$key][$name];

}

}

class C extends core {}

class DB extends discuz_database {}

?>