解读微擎之----bootstrap.inc.php

加载各种静态资源，定义大量$_W下变量的值，判断是否安装微擎，设置phpini的值，$_W[]判断http发送的方式

';
		//strpos("$atr","a")查找 "a" 在字符串$atr中第一次出现的位置
		echo "·如果你还没安装本程序，请运行 install.php 进入安装>> 

";
		echo "  Power by WE7 " . IMS_VERSION . "  微擎公众平台自助开源引擎";
		exit();
	} else {
		header('Content-Type: text/html; charset=utf-8');
		exit('配置文件不存在或是不可读，请检查“data/config”文件或是重新安装！');
	}
}

require $configfile;
require IA_ROOT . '/framework/version.inc.php';//定义了三个常量
require IA_ROOT . '/framework/const.inc.php';//大量常量的定义
require IA_ROOT . '/framework/class/loader.class.php';//load()机制加载文件
load()->func('global');
load()->func('compat');
load()->func('pdo');
load()->classs('account');
load()->classs('agent');
load()->model('cache');
load()->model('account');
load()->model('setting');

define('CLIENT_IP', getip());

$_W['config'] = $config;
$_W['config']['db']['tablepre'] = !empty($_W['config']['db']['master']['tablepre']) ? $_W['config']['db']['master']['tablepre'] : $_W['config']['db']['tablepre'];
$_W['timestamp'] = TIMESTAMP;//定义当前时间戳常量
$_W['charset'] = $_W['config']['setting']['charset'];
$_W['clientip'] = CLIENT_IP;

//$config在$configfile加载的config.php中定义的数组
unset($configfile, $config);//销毁常量$configfile, $config

//IA_ROOT本页第十行返回当前目录
define('ATTACHMENT_ROOT', IA_ROOT .'/attachment/');

define('DEVELOPMENT', $_W['config']['setting']['development'] == 1);
if(DEVELOPMENT) {
	//PHP ini_set用来设置php.ini的值，在函数执行的时候生效，脚本结束后，设置失效。无需打开php.ini文件，就能修改配置，
	ini_set('display_errors', '1');
	//规定不同的错误级别报告：  // 报告 E_NOTICE 之外的所有错误
	error_reporting(E_ALL ^ E_NOTICE);
} else {
	error_reporting(0);// 关闭错误报告
}
//in_array("Mark", $people)检测$people中会否存在Mark返回布尔值
if(!in_array($_W['config']['setting']['cache'], array('mysql', 'memcache', 'redis'))) {
	$_W['config']['setting']['cache'] = 'mysql';
}
load()->func('cache');

//function_exists();检测函数是否已经定义返回布尔值
if(function_exists('date_default_timezone_set')) {
	date_default_timezone_set($_W['config']['setting']['timezone']);
}
if(!empty($_W['config']['setting']['memory_limit']) && function_exists('ini_get') && function_exists('ini_set')) {
	//ini_get是获取php.ini里的环境变量的值。
	if(@ini_get('memory_limit') != $_W['config']['setting']['memory_limit']) {
		@ini_set('memory_limit', $_W['config']['setting']['memory_limit']);
	}
}
if (isset($_W['config']['setting']['https'])) {
	$_W['ishttps'] = $_W['config']['setting']['https'];
} else {

	//和$_SERVER有关的解释参考http://blog.csdn.net/jinxingfeng_cn/article/details/24960981
	$_W['ishttps'] = $_SERVER['SERVER_PORT'] == 443 || 
					//strtolower()把所有字符转换为小写
					(isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) != 'off') ||
					strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) == 'https' ||
					strtolower($_SERVER['HTTP_X_CLIENT_SCHEME']) == 'https' 					? true : false;
}
//判断请求是否为ajax请求
$_W['isajax'] = isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';

$_W['ispost'] = $_SERVER['REQUEST_METHOD'] == 'POST';

$_W['sitescheme'] = $_W['ishttps'] ? 'https://' : 'http://';
//htmlspecialchars($str)转化$str为输出为html
$_W['script_name'] = htmlspecialchars(scriptname());
//substr($str,6,5) 函数返回字符串第六个字符开始的五个字符
$sitepath = substr($_SERVER['PHP_SELF'], 0, strrpos($_SERVER['PHP_SELF'], '/'));
$_W['siteroot'] = htmlspecialchars($_W['sitescheme'] . $_SERVER['HTTP_HOST'] . $sitepath);

if(substr($_W['siteroot'], -1) != '/') {
	$_W['siteroot'] .= '/';
}
//parse_url($url);解析url返回数组
$urls = parse_url($_W['siteroot']);
$urls['path'] = str_replace(array('/web', '/app', '/payment/wechat', '/payment/alipay', '/api'), '', $urls['path']);
$_W['siteroot'] = $urls['scheme'].'://'.$urls['host'].((!empty($urls['port']) && $urls['port']!='80') ? ':'.$urls['port'] : '').$urls['path'];
$_W['siteurl'] = $urls['scheme'].'://'.$urls['host'].((!empty($urls['port']) && $urls['port']!='80') ? ':'.$urls['port'] : '') . $_W['script_name'] . (empty($_SERVER['QUERY_STRING'])?'':'?') . $_SERVER['QUERY_STRING'];

//MAGIC_QUOTES_GPC本页13行
if(MAGIC_QUOTES_GPC) {
	//istripslashes()删除反斜杠
	$_GET = istripslashes($_GET);
	$_POST = istripslashes($_POST);
	$_COOKIE = istripslashes($_COOKIE);
}
$cplen = strlen($_W['config']['cookie']['pre']);
foreach($_COOKIE as $key => $value) {
	if(substr($key, 0, $cplen) == $_W['config']['cookie']['pre']) {
		$_GPC[substr($key, $cplen)] = $value;
	}
}
unset($cplen, $key, $value);

//array_merge合并数组
$_GPC = array_merge($_GET, $_POST, $_GPC);
$_GPC = ihtmlspecialchars($_GPC);//没有查到ihtmlspecialchars
if(!$_W['isajax']) {
	//file_get_contents() 函数把整个文件读入一个字符串中。
	$input = file_get_contents("php://input");
	if (!empty($input)) {
		$__input = @json_decode($input, true);
		if (!empty($__input)) {
			$_GPC['__input'] = $__input;
			$_W['isajax'] = true;
		}
	}
	unset($input, $__input);//销毁变量
}

setting_load();//见model/seting.mod.php 31行
if (empty($_W['setting']['upload'])) {
	$_W['setting']['upload'] = array_merge($_W['config']['upload']);
}
$_W['attachurl'] = $_W['attachurl_local'] = $_W['siteroot'] . $_W['config']['upload']['attachdir'] . '/';
if (!empty($_W['setting']['remote']['type'])) {
	//ATTACH_FTP见framework/version.inc.php47行
	if ($_W['setting']['remote']['type'] == ATTACH_FTP) {
		$_W['attachurl'] = $_W['attachurl_remote'] = $_W['setting']['remote']['ftp']['url'] . '/';
	} elseif ($_W['setting']['remote']['type'] == ATTACH_OSS) {
		$_W['attachurl'] = $_W['attachurl_remote'] = $_W['setting']['remote']['alioss']['url'].'/';
	} elseif ($_W['setting']['remote']['type'] == ATTACH_QINIU) {
		$_W['attachurl'] = $_W['attachurl_remote'] = $_W['setting']['remote']['qiniu']['url'].'/';
	} elseif ($_W['setting']['remote']['type'] == ATTACH_COS) {
		$_W['attachurl'] = $_W['attachurl_remote'] = $_W['setting']['remote']['cos']['url'].'/';
	}
}
$_W['os'] = Agent::deviceType();//framework/agent.class.php36行
if($_W['os'] == Agent::DEVICE_MOBILE) {
	$_W['os'] = 'mobile';
} elseif($_W['os'] == Agent::DEVICE_DESKTOP) {
	$_W['os'] = 'windows';
} else {
	$_W['os'] = 'unknown';
}

$_W['container'] = Agent::browserType();
if(Agent::isMicroMessage() == Agent::MICRO_MESSAGE_YES) {
	$_W['container'] = 'wechat';
} elseif ($_W['container'] == Agent::BROWSER_TYPE_ANDROID) {
	$_W['container'] = 'android';
} elseif ($_W['container'] == Agent::BROWSER_TYPE_IPAD) {
	$_W['container'] = 'ipad';
} elseif ($_W['container'] == Agent::BROWSER_TYPE_IPHONE) {
	$_W['container'] = 'iphone';
} elseif ($_W['container'] == Agent::BROWSER_TYPE_IPOD) {
	$_W['container'] = 'ipod';
} else {
	$_W['container'] = 'unknown';
}

$controller = $_GPC['c'];
$action = $_GPC['a'];
$do = $_GPC['do'];
header('Content-Type: text/html; charset=' . $_W['charset']);