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
<?php
/**
* [WeEngine System] Copyright (c) 2014 WE7.CC
* WeEngine is NOT a free software, it under the license terms, visited http://www.we7.cc/ for more details.
*/
define('IN_IA', true);
define('STARTTIME', microtime());//返回当前 Unix 时间戳的微秒数：
//str_replace替换字符
//dirname(__FILE___) 函数返回的是脚本所在在的路径。
define('IA_ROOT', str_replace("\\", '/', dirname(dirname(__FILE__))));
//function_exists检测函数是否被定义
//ini_get是获取php.ini里的环境变量的值。
define('MAGIC_QUOTES_GPC', (function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc()) || @ini_get('magic_quotes_sybase'));
define('TIMESTAMP', time());//定义当前时间戳常量
$_W = $_GPC = array();
//config.php封装$config数组
//例$config['db']['master']['host'] = '127.0.0.1';
$configfile = IA_ROOT . "/data/config.php";
//file_exists检查文件是否存在 返回布尔值
if(!file_exists($configfile)) {
if(file_exists(IA_ROOT . '/install.php')) {
header('Content-Type: text/html; charset=utf-8');
//version.inc.php定义了IMS开头的三个变量如下
//define('IMS_FAMILY', 'v');
//define('IMS_VERSION', '1.0');
//define('IMS_RELEASE_DATE', '201706270001');
require IA_ROOT . '/framework/version.inc.php';
echo '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
//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<a href='".(strpos($_SERVER['SCRIPT_NAME'], 'web') === false ? './install.php' : '../install.php')."'> install.php 进入安装>> </a><br/><br/>";
echo " <a href='http://www.we7.cc' style='font-size:12px' target='_blank'>Power by WE7 " . IMS_VERSION . " 微擎公众平台自助开源引擎</a>";
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']);