php discuz核心类函数分析
Java代码
<?php
/**
* [Discuz!] (C)2001-2099 Comsenz Inc.
* This is NOT a freeware, use is subject to license terms
*
* $Id: class_core.php 6914 2010-03-26 12:52:36Z cnteacher $
*/
///TODO 是将要完成的功能，包括禁止ip和禁止访问
//TODO 禁止ip
//TODO 禁止访问
///和DZ72一样，确保所有文件需要先加载核心文件
define('IN_DISCUZ', true);
/**
* Discuz 核心引擎
* 其他处理代码当中用到的变量不要在本核心 new 之前设置， 否则会自动清空
*
*/
class discuz_core {
// 数据库存储引擎
var $db = null;
// 内存缓冲object
var $mem = null;
// 会话 object
var $session = null;
// 程序配置
var $config = array();
// $_G 数组的映射
var $var = array();
// 加载缓存的数组
var $cachelist = array();
// 是否初始化
var $init_setting = true; //设置
var $init_user = true;//用户
var $init_session = true;//会话
var $init_cron = true;//任务计划
var $init_misc = true;//其他功能
var $init_memory = true;//内存
// 是否已经初始化
var $initated = false;
var $superglobal = array(
'GLOBALS' => 1,
'_GET' = 1,
'_POST' = 1,
'_REQUEST' = 1,
'_COOKIE' = 1,
'_SERVER' = 1,
'_ENV' = 1,
'_FILES' = 1,
);
function &instance() {
static $object;
if(empty($object)) {
$object = new discuz_core();
}
return $object;
}
function discuz_core() {
$this->_init_env();
$this->_init_config();
$this->_init_input();
$this->_init_output();
}
function init() {
if(!$this->initated) {
$this->_init_db();
$this->_init_memory();
$this->_init_user();
$this->_init_session();
$this->_init_setting();
$this->_init_cron();
$this->_init_misc();
}
$this->initated = true;
}
function _init_env() {
error_reporting(E_ALL ^ E_NOTICE);
// error_reporting(E_ALL);
///php 5.3前则关闭魔法引号匹配(自动转义)
if(phpversion() < '5.3.0') {
set_magic_quotes_runtime(0);
}
///程序主目录，根据核心文件确定，原来是-7 代表在include下,现在是12代表在source/class下
define('DISCUZ_ROOT', substr(dirname(__FILE__), 0, -12));
///和dz72一样，设置魔法引用(自动转义，单双引号反斜线)
define('MAGIC_QUOTES_GPC', function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc());
///判断字符编码转换函数是否存在
define('ICONV_ENABLE', function_exists('iconv'));
///亚洲字符转码函数是否存在, 因为mb_开头字符处理亚洲字符会比较高效，初步判断用于转码时先用mb_来处理:
define('MB_ENABLE', function_exists('mb_convert_encoding'));
///是否存在输出缓存压缩函数，这个函数的目的，是在确认浏览器支持页面压缩后，才用该函数来压缩所有输出内容，否则直接传输
define('EXT_OBGZIP', function_exists('ob_gzhandler'));
///和DZ72一样，不过当前时间戳被定义为一个常量，效率更高吧，也不用global了。
define('TIMESTAMP', time());
///获取默认时区
discuz_core::timezone_set();
///加载function_core.php，作用推测类似global.func.php
if(!defined('DISCUZ_CORE_FUNCTION') && !@include(DISCUZ_ROOT.'./source/function/function_core.php')) {
$this->error('function_core.php is missing');
}
//判断浏览器是否是蜘蛛
define('IS_ROBOT', checkrobot());
//清理全局变量
///全清理了，真是彻底把所有变量都从内存中注销了
foreach ($GLOBALS as $key = $value) {
if (!isset($this->superglobal[$key])) {
$GLOBALS[$key] = null; unset($GLOBALS[$key]);
}
}
// 配置全局变量
///和上一步结合，只留下自己需要的变量，并初始化。
///这么做够狠，只要稍微小心点，就不会出现因为变量未初始化而出现的安全问题
global $_G;
$_G = array(
//公用全局定义
'uid' = 0,
'username' = '',
'adminid' = 0,
'groupid' = 1,
'sid' = '',
'formhash' = '',
'timestamp' = TIMESTAMP,
'starttime' = dmicrotime(),
'clientip' = $this->_get_client_ip(),
'referer' = '',
'charset' = '',
'gzipcompress' = '',
'authkey' = '',
'timenow' = array(),
'PHP_SELF' = '',
'siteurl' = '',
//公用全局数组定义
'config' = array(),
'setting' = array(),
'member' = array(),
'group' = array(),
'cookie' = array(),
'style' = array(),
'cache' = array(),
'session' = array(),
'lang' = array(),
'my_app' = array(),//默认应用
'my_userapp' = array(),//用户自添加应用
//论坛全局定义
'fid' = 0,
'tid' = 0,
'forum' = array(),
'rssauth' = '',
//uch 全局定义
'home' = array(),
'space' = array(),
//portal 全局定义
'block' = array(),
'article' = array(),
//Action
'action' = array(
'action' = APPTYPEID,
'fid' = 0,
'tid' = 0,
)
);
//相对主目录的相对地址及文件名
$_G['PHP_SELF'] = htmlspecialchars($_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME']);
//基本脚本名，每个功能脚本首页前都会定义
//比如forum.php，则定义CURSCRIPT为forum,而forum_forumdisplay.php则不定义，因为属于forum
$_G['basescript'] = CURSCRIPT;
//站点网址
$_G['siteurl'] = htmlspecialchars('http://'.$_SERVER['HTTP_HOST'].preg_replace("/\/+(api)?\/*$/i", '', substr($_G['PHP_SELF'], 0, strrpos($_G['PHP_SELF'], '/'))).'/');
///$_G的映射，也即超级全局变量
$this->var = & $_G;
}
function _init_input() {
//note 禁止对全局变量注入
///和dz72类似，禁止GLOBALS=xxx的方式注入
if (isset($_REQUEST['GLOBALS']) || isset($_FILES['GLOBALS'])) {
error('request_tainting');
}
if(!empty($_GET['rewrite'])) {
$query_string = '?mod=';
$param = explode('-', $_GET['rewrite']);
$query_string .= $_GET['mod'] = $param[0];
array_shift($param);
$paramc = count($param);
for($i = 0;$i < $paramc;$i+=2) {
$_REQUEST[$param[$i]] = $_GET[$param[$i]] = $param[$i + 1];
$query_string .= '&'.$param[$i].'='.$param[$i + 1];
}
$_SERVER['QUERY_STRING'] = $query_string;
unset($param, $paramc, $query_string);
}
// slashes 处理,如果没有魔法引号处理（自动转义），则手动转义GET/POST/COOKIE/FILES中的单双引号、null反斜线\
if(!MAGIC_QUOTES_GPC) {
$_GET = daddslashes($_GET);
$_POST = daddslashes($_POST);
$_COOKIE = daddslashes($_COOKIE);
$_FILES = daddslashes($_FILES);
}
//cookie 处理
///验证cookie前缀与config中的设置值是否一致，一致则转为$cookie数组中的值
$prelength = strlen($this->config['cookie']['cookiepre']);
foreach($_COOKIE as $key = $val) {
if(substr($key, 0, $prelength) == $this->config['cookie']['cookiepre']) {
$this->var['cookie'][substr($key, $prelength)] = $val;
}
}
$_GET['diy'] = empty($_GET['diy']) ? '' : $_GET['diy'];
///$_GET和$_POST转成与索引同名加"gp_"前缀的变量
///如$_GET['username']直接用$gp_username来访问
foreach(array_merge($_POST, $_GET) as $k = $v) {
$this->var['gp_'.$k] = $v;
}
///根据$_GET['mod']来确定m的值，$this->var为全局数组,gp_为上个语句的附加前缀
$this->var['mod'] = empty($this->var['gp_mod']) ? '' : htmlspecialchars($this->var['gp_mod']);
///如果使用ajax，再判断是post传值或get和xmlhttprequest同时有效
$this->var['inajax'] = empty($this->var['gp_inajax']) ? 0 : ($_SERVER['REQUEST_METHOD'] == 'GET' && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' || $_SERVER['REQUEST_METHOD'] == 'POST' ? 1 : 0);
///当前页码
$this->var['page'] = empty($this->var['gp_page']) ? 1 : max(1, intval($this->var['gp_page']));
///确定cookie中的sid值
$this->var['sid'] = $this->var['cookie']['sid'] = isset($this->var['cookie']['sid']) ? htmlspecialchars($this->var['cookie']['sid']) : '';
}
///初始化设置
function _init_config() {
///加载设置文件
$_config = array();
@include DISCUZ_ROOT.'./config/config_global.php';
if(empty($_config)) {
error('config_notfound');
}
///确定密钥，如果值为空，则密钥默认为cookie前缀与数据库名拼接的md5值，否则为配置文件中的值
///authkey密钥是sid等参数加解密的重要参数
$_config['security']['authkey'] = empty($config['security']['authkey']) ? md5($_config['cookie']['cookiepre'].$_config['db'][1]['dbname']) : ($config['security']['authkey']);
$this->config = & $_config;
///Discuz的调试
if(empty($this->config['debug']) || !file_exists(libfile('function/debug'))) {
define('DISCUZ_DEBUG', false);
} elseif($this->config['debug'] === 1 || $this->config['debug'] === 2 || !empty($_REQUEST['debug']) && $_REQUEST['debug'] === $this->config['debug']) {
define('DISCUZ_DEBUG', true);
if($this->config['debug'] == 2) {
error_reporting(E_ALL);
}
}
$GLOBALS['_G']['config'] = & $this->config;
///以浏览器版本为参考，进行密钥的二次md5加密
$GLOBALS['_G']['authkey'] = md5($this->config['security']['authkey'].$_SERVER['HTTP_USER_AGENT']);
}
function _init_output() {
///如果设置中打开xss跨站脚本的防御模式，且网址中存在"<"和"""等非法字符，则拒绝请求
if($this->config['security']['urlxssdefend'] && !empty($_SERVER['REQUEST_URI'])) {
$temp = urldecode($_SERVER['REQUEST_URI']);
if(strpos($temp, '<') !== false || strpos($temp, '"') !== false) {
error('request_tainting');
}
}
///存在ob_gzhandler则启用输出缓存压缩
if($this->config['output']['gzip'] && EXT_OBGZIP) {
ob_start('ob_gzhandler');
setglobal('gzipcompress', true);
} else {
ob_start();
setglobal('gzipcompress', false);
}
///确定HTML页面编码，及其他编码
if($this->config['output']['forceheader']) {
@header('Content-Type: text/html; charset='.$this->config['output']['charset']);
}
setglobal('charset', $this->config['output']['charset']);
define('CHARSET', $this->config['output']['charset']);
}
///拒绝机器人访问
function reject_robot() {
if(IS_ROBOT) {
exit(header("HTTP/1.1 403 Forbidden"));
}
}
///获取客户端ip，
function _get_client_ip() {
$clientip = '';
///环境变量客户端ip有值且字符长度大于unknown，则说明该变量有效，确定为客户端ip
if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
$clientip = getenv('HTTP_CLIENT_IP');
///否则取当前浏览用户的网关ip地址
} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
$clientip = getenv('HTTP_X_FORWARDED_FOR');
///用户计算机的ip地址
} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
$clientip = getenv('REMOTE_ADDR');
} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
$clientip = $_SERVER['REMOTE_ADDR'];
}
///判断是否是数字与点组成的7-15位字符
preg_match("/[\d\.]{7,15}/", $clientip, $clientipmatches);
$clientip = $clientipmatches[0] ? $clientipmatches[0] : 'unknown';
return $clientip;
}
function _init_db() {
///生成数据库对象
$this->db = & DB::object();
///加载设置文件并连接数据库
$this->db->set_config($this->config['db']);
$this->db->connect();
}
function _init_session() {
$this->session = new discuz_session();
if($this->init_session)
{
///传入sid，客户端ip与uid作为session判断机制，分新老用户，老用户则查session表，否则创建
$this->session->init($this->var['cookie']['sid'], $this->var['clientip'], $this->var['uid']);
$this->var['sid'] = $this->session->sid;
$this->var['session'] = $this->session->var;
if($this->var['sid'] != $this->var['cookie']['sid']) {
dsetcookie('sid', $this->var['sid'], 86400);
}
// 首次登陆更新最后访问时间，每隔 10 分钟更新用户最后动作时间
if($this->var['uid'] && ($this->session->isnew || ($this->session->get('lastactivity') + 600) < TIMESTAMP)) {
$this->session->set('lastactivity', TIMESTAMP);
$update = array('lastip' = $this->var['clientip'], 'lastactivity' = TIMESTAMP);
if($this->session->isnew) {
$update['lastvisit'] = TIMESTAMP;
}
更新会员状态
DB::update('common_member_status', $update, "uid='".$this->var['uid']."'");
}
}
}
function _init_user() {
if($this->init_user) {
if($auth = getglobal('auth', 'cookie')) {
$auth = daddslashes(explode("\t", authcode($auth, 'DECODE')));
}
list($discuz_pw, $discuz_uid) = empty($auth) || count($auth) < 2 ? array('', '') : $auth;
if($discuz_uid) {
$user = getuserbyuid($discuz_uid);
}
if(!empty($user) && $user['password'] == $discuz_pw) {
$this->var['member'] = $user;
} else {
$user = array();
$this->_init_guest();
}
$this->cachelist[] = 'usergroup_'.$this->var['member']['groupid'];
if($user && $user['adminid'] 0 && $user['groupid'] != $user['adminid']) {
$this->cachelist[] = 'admingroup_'.$this->var['member']['adminid'];
}
} else {
$this->_init_guest();
}
if(empty($this->var['cookie']['lastvisit'])) {
$this->var['member']['lastvisit'] = TIMESTAMP - 3600;
dsetcookie('lastvisit', TIMESTAMP - 3600, 86400 * 30);
} else {
$this->var['member']['lastvisit'] = empty($this->var['cookie']['lastvisit']);
}
setglobal('uid', getglobal('uid', 'member'));
setglobal('username', addslashes(getglobal('username', 'member')));
setglobal('adminid', getglobal('adminid', 'member'));
setglobal('groupid', getglobal('groupid', 'member'));
}
function _init_guest() {
setglobal('member', array( 'uid' = 0, 'username' = '', 'groupid' = 7, 'credits' = 0, 'timeoffset' = 9999));
}
function _init_cron() {
if($this->init_cron && $this->init_setting) {
if($this->var['cache']['cronnextrun'] <= TIMESTAMP) {
discuz_cron::run();
}
}
}
function _init_misc() {
if(!$this->init_misc) {
return false;
}
// 调入核心语言包
lang('core');
//处理全局时区设置
if($this->init_setting && $this->init_user) {
if(!isset($this->var['member']['timeoffset']) || $this->var['member']['timeoffset'] == 9999 || $this->var['member']['timeoffset'] === '') {
$this->var['member']['timeoffset'] = $this->var['setting']['timeoffset'];
}
}
$timeoffset = $this->init_setting ? $this->var['member']['timeoffset'] : $this->var['setting']['timeoffset'];
$this->var['timenow'] = array(
'time' = dgmdate(TIMESTAMP),
'offset' = $timeoffset = 0 ? ($timeoffset == 0 ? '' : '+'.$timeoffset) : $timeoffset
);
$this->timezone_set($timeoffset);
$this->var['formhash'] = formhash();
define('FORMHASH', $this->var['formhash']);
// 定义风格常量
if(is_array($this->var['style'])) {
foreach ($this->var['style'] as $key = $val) {
$key = strtoupper($key);
if(!defined($key) && !is_array($val)) {
define($key, $val);
}
}
}
//论坛开关检查
if($this->var['setting']['**losed'] && !(in_array($this->var['mod'], array('logging', 'seccode')) || getglobal('adminid', 'member') == 1)) {
$closedreason = DB::result_first("SELECT svalue FROM ".DB::table('common_setting')." WHERE skey='closedreason'");
showmessage($closedreason ? $closedreason : 'board_closed', NULL, array(), array('login' = 1));
}
$this->var['tpp'] = $this->var['setting']['topicperpage'] ? intval($this->var['setting']['topicperpage']) : 20;
$this->var['ppp'] = $this->var['setting']['postperpage'] ? intval($this->var['setting']['postperpage']) : 10;
if($this->var['setting']['nocacheheaders']) {
@header("Expires: -1");
@header("Cache-Control: no-store, private, post-check=0, pre-check=0, max-age=0", FALSE);
@header("Pragma: no-cache");
}
$lastact = TIMESTAMP."\t".htmlspecialchars(basename($this->var['PHP_SELF']))."\t".htmlspecialchars($this->var['mod']);
dsetcookie('lastact', $lastact, 86400);
}
function _init_setting() {
if($this->init_setting) {
if(empty($this->var['setting'])) {
$this->cachelist[] = 'setting';
}
if(empty($this->var['style'])) {
$this->cachelist[] = 'style_default';
}
if(!isset($this->var['cache']['cronnextrun'])) {
$this->cachelist[] = 'cronnextrun';
}
}
!empty($this->cachelist) && loadcache($this->cachelist);
if(!is_array($this->var['setting'])) {
$this->var['setting'] = array();
}
if($this->var['member'] && $this->var['member']['adminid'] 0 && $this->var['member']['groupid'] != $this->var['member']['adminid'] && !empty($this->var['cache']['admingroup_'.$this->var['member']['adminid']])) {
$this->var['group'] = array_merge($this->var['group'], $this->var['cache']['admingroup_'.$this->var['member']['adminid']]);
}
}
function _init_memory() {
$this->mem = new discuz_memory();
if($this->init_memory) {
$this->mem->init($this->config['memory']);
}
$this->var['memory'] = $this->mem->type;
}
function timezone_set($timeoffset = 0) {
if(function_exists('date_default_timezone_set')) {
@date_default_timezone_set('Etc/GMT'.($timeoffset 0 ? '-' : '+').(abs($timeoffset)));
}
}
function error($msg, $halt = true) {
$this->error_log($msg);
echo $msg;
$halt && exit();
}
function error_log($message) {
$time = date("Y-m-d H:i:s", TIMESTAMP);
$file = DISCUZ_ROOT.'./data/log/errorlog_'.date("Ym").'.txt';
$message = "\n#{$time}:\t".str_replace(array("\t", "\r", "\n"), " ", $message);
error_log($message, 3, $file);
}
}
/**
* Discuz MySQL 类的支持
*
*/
class db_mysql
{
var $tablepre;
var $version = '';
var $querynum = 0;
var $curlink;
var $link = array();
var $config = array();
var $sqldebug = array();
function db_mysql($config = array()) {
if(!empty($config)) {
$this->set_config($config);
}
}
function set_config($config) {
$this->config = &$config;
$this->tablepre = $config['1']['tablepre'];
}
function connect() {
if(empty($this->config) || empty($this->config[1])) {
$this->halt('notfound_config');
}
foreach ($this->config as $id = $config) {
$this->link[$id] = $this->_dbconnect(
$config['dbhost'],
$config['dbuser'],
$config['dbpw'],
$config['dbcharset'],
$config['dbname'],
$config['pconnect']
);
}
$this->curlink = $this->link[1];
}
function _dbconnect($dbhost, $dbuser, $dbpw, $dbcharset, $dbname, $pconnect) {
$link = null;
$func = empty($pconnect) ? 'mysql_connect' : 'mysql_pconnect';
if(!$link = @$func($dbhost, $dbuser, $dbpw, 1)) {
$this->halt('notconnect');
} else {
$this->curlink = $link;
if($this->version() '4.1') {
$serverset = $dbcharset ? 'character_set_connection='.$dbcharset.', character_set_results='.$dbcharset.', character_set_client=binary' : '';
$serverset .= $this->version() '5.0.1' ? ((empty($serverset) ? '' : ',').'sql_mode=\'\'') : '';
$serverset && mysql_query("SET $serverset", $link);
}
$dbname && @mysql_select_db($dbname, $link);
}
return $link;
}
function table_name($tablename) {
return $this->tablepre.$tablename;
}
function select_db($dbname) {
return mysql_select_db($dbname, $this->curlink);
}
function fetch_array($query, $result_type = MYSQL_ASSOC) {
return mysql_fetch_array($query, $result_type);
}
function fetch_first($sql) {
return $this->fetch_array($this->query($sql));
}
function result_first($sql) {
return $this->result($this->query($sql), 0);
}
function query($sql, $type = '') {
if(defined('DISCUZ_DEBUG') && DISCUZ_DEBUG) {
$starttime = dmicrotime();
}
$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ?
'mysql_unbuffered_query' : 'mysql_query';
if(!($query = $func($sql, $this->curlink))) {
if(in_array($this->errno(), array(2006, 2013)) && substr($type, 0, 5) != 'RETRY') {
$this->connect();
return $this->query($sql, 'RETRY'.$type);
}
if($type != 'SILENT' && substr($type, 5) != 'SILENT') {
$this->halt('query_error', $sql);
}
}
if(defined('DISCUZ_DEBUG') && DISCUZ_DEBUG) {
$this->sqldebug[] = array($sql, number_format((dmicrotime() - $starttime), 6), debug_backtrace());
}
$this->querynum++;
return $query;
}
function affected_rows() {
return mysql_affected_rows($this->curlink);
}
function error() {
return (($this->curlink) ? mysql_error($this->curlink) : mysql_error());
}
function errno() {
return intval(($this->curlink) ? mysql_errno($this->curlink) : mysql_errno());
}
function result($query, $row = 0) {
$query = @mysql_result($query, $row);
return $query;
}
function num_rows($query) {
$query = mysql_num_rows($query);
return $query;
}
function num_fields($query) {
return mysql_num_fields($query);
}
function free_result($query) {
return mysql_free_result($query);
}
function insert_id() {
return ($id = mysql_insert_id($this->curlink)) = 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0);
}
function fetch_row($query) {
$query = mysql_fetch_row($query);
return $query;
}
function fetch_fields($query) {
return mysql_fetch_field($query);
}
function version() {
if(empty($this->version)) {
$this->version = mysql_get_server_info($this->curlink);
}
return $this->version;
}
function close() {
return mysql_close($this->curlink);
}
function halt($message = '', $sql = '') {
global $_G;
$dberror = $this->error();
$dberrno = $this->errno();
$phperror = '<table style="font-size:11px" cellpadding="0"><tr><td width="270">File</td><td width="80">Line</td><td>Function</td></tr>';
foreach (debug_backtrace() as $error) {
$error['file'] = str_replace(DISCUZ_ROOT, '', $error['file']);
$error['class'] = isset($error['class']) ? $error['class'] : '';
$error['type'] = isset($error['type']) ? $error['type'] : '';
$error['function'] = isset($error['function']) ? $error['function'] : '';
$phperror .= "<tr><td>$error[file]</td><td>$error[line]</td><td>$error[class]$error[type]$error[function]()</td></tr>";
}
$phperror .= '</table>';
$helplink = "http://faq.comsenz.com/?type=mysql&dberrno=".rawurlencode($dberrno)."&dberror=".rawurlencode($dberror);
@header('Content-Type: text/html; charset='.$_G['config']['output']['charset']);
echo '<div style="position:absolute;font-size:11px;font-family:verdana,arial;background:#EBEBEB;padding:0.5em;line-height:1.5em">'.
error('db_error', array(
'$message' = error('db_'.$message, array(), true),
'$info' = $dberror ? error('db_error_message', array('$dberror' = $dberror), true) : '',
'$sql' = $sql ? error('db_error_sql', array('$sql' = $sql), true) : '',
'$errorno' = $dberrno ? error('db_error_no', array('$dberrno' = $dberrno), true) : '',
'$helplink' = $helplink,
), true);
echo "<b>PHP Backtrace</b><br />$phperror<br /></div>";
exit();
}
}
/**
* 对Discuz CORE 中 DB Object中的主要方法进行二次封装，方便程序调用
*
*/
class DB
{
/**
* 返回表名(pre_$table)
*
* @param 原始表名 $table
* @return 增加pre之后的名字
*/
function table($table) {
$a = & DB::object();
return $a->table_name($table);
}
/**
* 删除一条或者多条记录
*
* @param string $table 原始表名
* @param string $condition 条件语句，不需要写WHERE
* @param int $limit 删除条目数
* @param boolean $unbuffered 立即返回？
*/
function delete($table, $condition, $limit = 0, $unbuffered = true) {
if(empty($condition)) {
$where = '1';
} elseif(is_array($condition)) {
$where = DB::implode_field_value($condition, ' AND ');
} else {
$where = $condition;
}
$sql = "DELETE FROM ".DB::table($table)." WHERE $where ".($limit ? "LIMIT $limit" : '');
return DB::query($sql, ($unbuffered ? 'UNBUFFERED' : ''));
}
/**
* 插入一条记录
*
* @param string $table 原始表名
* @param array $data 数组field->vlaue 对
* @param boolen $return_insert_id 返回 InsertID?
* @param boolen $replace 是否是REPLACE模式
* @param boolen $silent 屏蔽错误？
* @return InsertID or Result
*/
function insert($table, $data, $return_insert_id = false, $replace = false, $silent = false) {
$sql = DB::implode_field_value($data);
$cmd = $replace ? 'REPLACE INTO' : 'INSERT INTO';
$table = DB::table($table);
$silent = $silent ? 'SILENT' : '';
$return = DB::query("$cmd $table SET $sql", $silent);
return $return_insert_id ? DB::insert_id() : $return;
}
/**
* 更新一条或者多条数据记录
*
* @param string $table 原始表名
* @param array $data 数据field-value
* @param string $condition 条件语句，不需要写WHERE
* @param boolean $unbuffered 迅速返回？
* @param boolan $low_priority 延迟更新？
* @return result
*/
function update($table, $data, $condition, $unbuffered = false, $low_priority = false) {
$sql = DB::implode_field_value($data);
$cmd = "UPDATE ".($low_priority ? 'LOW_PRIORITY' : '');
$table = DB::table($table);
$where = $comma = '';
if(empty($condition)) {
$where = '1';
} elseif(is_array($condition)) {
$where = DB::implode_field_value($condition, ' AND ');
} else {
$where = $condition;
}
$res = DB::query("$cmd $table SET $sql WHERE $where", $unbuffered ? 'UNBUFFERED' : '');
return $res;
}
/**
* 格式化field字段和value，并组成一个字符串
*
* @param array $array 格式为 key=value 数组
* @param 分割符 $glue
* @return string
*/
function implode_field_value($array, $glue = ',') {
//print_r(debug_backtrace());
$sql = $comma = '';
foreach ($array as $k = $v) {
$sql .= $comma."`$k`='$v'";
$comma = $glue;
}
return $sql;
}
/**
* 返回插入的ID
*
* @return int
*/
function insert_id() {
$db = & DB::object();
return $db->insert_id();
}
/**
* 依据查询结果，返回一行数据
*
* @param resourceID $resourceid
* @return array
*/
function fetch($resourceid) {
$db = & DB::object();
return $db->fetch_array($resourceid);
}
/**
* 依据SQL文，返回一条查询结果
*
* @param string $query 查询语句
* @return array
*/
function fetch_first($sql) {
$db = & DB::object();
return $db->fetch_first($sql);
}
/**
* 依据查询结果，返回结果数值
*
* @param resourceid $resourceid
* @return string or int
*/
function result($resourceid, $row = 0) {
$db = & DB::object();
return $db->result($resourceid, $row);
}
/**
* 依据查询语句，返回结果数值
*
* @param string $query SQL查询语句
* @return unknown
*/
function result_first($sql) {
$db = & DB::object();
return $db->result_first($sql);
}
/**
* 执行查询
*
* @param string $sql
* @param 类型定义 $type UNBUFFERED OR SILENT
* @return Resource OR Result
*/
function query($sql, $type = '') {
$db = & DB::object();
return $db->query($sql, $type);
}
/**
* 返回select的结果行数
*
* @param resource $resourceid
* @return int
*/
function num_rows($resourceid) {
$db = & DB::object();
return $db->num_rows($resourceid);
}
/**
* 返回sql语句所影响的记录行数
*
* @return int
*/
function affected_rows() {
$db = & DB::object();
return $db->affected_rows();
}
function free_result($query) {
$db = & DB::object();
return $db->free_result($query);
}
function error() {
$db = & DB::object();
return $db->error();
}
function errno() {
$db = & DB::object();
return $db->errno();
}
/**
* 返回 DB object 指针
*
* @return pointer of db object from discuz core
*/
function &object() {
static $db;
if(empty($db)) {
$db = new db_mysql();
}
return $db;
}
}
class discuz_session {
///sid,ip1-4, uid, username, groupid组id, invisible隐身与否,action行为,上次活动lastactivity,fid板块id,tid帖子id
var $sid = null;
var $var;
var $isnew = false;
var $newguest = array('sid' = 0, 'ip1' = 0, 'ip2' = 0, 'ip3' = 0, 'ip4' = 0,
'uid' = 0, 'username' = '', 'groupid' = 7, 'invisible' = 0, 'action' = 0,
'lastactivity' = 0, 'fid' = 0, 'tid' = 0);
var $old = array('sid' = '', 'ip' = '', 'uid' = 0);
///与类同名的函数，构造函数，初始化session各值
function discuz_session($sid = '', $ip = '', $uid = 0) {
$this->old = array('sid' = $sid, 'ip' = $ip, 'uid' = $uid);
$this->var = $this->newguest;
if(!empty($ip)) {
$this->init($sid, $ip, $uid);
}
}
///设置$newguest各项值
function set($key, $value) {
if(isset($this->newguest[$key])) {
$this->var[$key] = $value;
} elseif ($key == 'ip') {
$ips = explode('.', $value);
$this->set('ip1', $ips[0]);
$this->set('ip2', $ips[1]);
$this->set('ip3', $ips[2]);
$this->set('ip4', $ips[3]);
}
}
///获取
function get($key) {
if(isset($this->newguest[$key])) {
return $this->var[$key];
} elseif ($key == 'ip') {
return $this->get('ip1').'.'.$this->get('ip2').'.'.$this->get('ip3').'.'.$this->get('ip4');
}
}
///初始化，sid有值则可能是老用户，去读session表，判断sid，ip符合的值是否存在，存在则赋值给$sid
function init($sid, $ip, $uid) {
$this->old = array('sid' = $sid, 'ip' = $ip, 'uid' = $uid);
$session = array();
if($sid) {
$session = DB::fetch_first("SELECT * FROM ".DB::table('common_session').
" WHERE sid='$sid' AND CONCAT_WS('.', ip1,ip2,ip3,ip4)='$ip'");
}
if(empty($session) || $session['uid'] != $uid) {
$session = $this->create($ip, $uid);
}
$this->var = $session;
$this->sid = $session['sid'];
}
///新用户
function create($ip, $uid) {
$this->isnew = true;
$this->var = $this->newguest;
$this->set('sid', random(6));
$this->set('uid', $uid);
$this->set('ip', $ip);
$this->set('lastactivity', time());
$this->sid = $this->var['sid'];
return $this->var;
}
function delete() {
$onlinehold = 1800; //此数值应当取自全局变量
$guestspan = 60; //避免游客重复激活sid
$onlinehold = time() - $onlinehold;
$guestspan = time() - $guestspan;
//当前用户的sid
$condition = " sid='{$this->sid}' ";
//过期的 session
$condition .= " OR lastactivity<$onlinehold ";
//频繁的同一ip游客
$condition .= " OR (uid='0' AND ip1='{$this->var['ip1']}' AND ip2='{$this->var['ip2']}' AND ip3='{$this->var['ip3']}' AND ip4='{$this->var['ip4']}' AND lastactivity$guestspan) ";
//当前用户的uid
$condition .= $this->var['uid'] ? " OR (uid='{$this->var['uid']}') " : '';
DB::delete('common_session', $condition);
}
function update() {
if($this->sid !== null) {
$data = daddslashes($this->var);
if($this->isnew) {
$this->delete();
DB::insert('common_session', $data, false, false, true);
} else {
DB::update('common_session', $data, "sid='$data[sid]'");
}
dsetcookie('sid', $this->sid, 86400);
}
}
/**
* 取在线用户数量
*
* @param int $type 0=全部 1=会员 2=游客
*/
function onlinecount($type = 0) {
$condition = $type == 1 ? ' WHERE uid0 ' : ($type == 2 ? ' WHERE invisible=1 ' : '');
return DB::result_first("SELECT count(*) FROM ".DB::table('common_session').$condition);
}
}
class discuz_cron
{
/**
* 运行cron
*
* @param int $cronid 执行某个cron，如果不指定则运行当前需要运行的
* @return true
*/
function run($cronid = 0) {
$timestamp = TIMESTAMP;
$cron = DB::fetch_first("SELECT * FROM ".DB::table('common_cron')."
WHERE ".($cronid ? "cronid='$cronid'" : "available'0' AND nextrun<='$timestamp'")."
ORDER BY nextrun LIMIT 1");
$processname ='DZ_CRON_'.(empty($cron) ? 'CHECKER' : $cron['cronid']);
if(!discuz_process::create($processname, 600)) {
return false;
}
if($cron) {
$cron['filename'] = str_replace(array('..', '/', '\\'), '', $cron['filename']);
$cronfile = DISCUZ_ROOT.'./source/include/cron/'.$cron['filename'];
$cron['minute'] = explode("\t", $cron['minute']);
discuz_cron::setnextime($cron);
@set_time_limit(1000);
@ignore_user_abort(TRUE);
if(!@include $cronfile) {
//debug('CRON', $cron['name'].' : Cron script('.$cron['filename'].') not found or syntax error', 0);
}
}
discuz_cron::nextcron();
discuz_process::delete($processname);
return true;
}
/**
* 设定下一个计划任务将要执行的时间 here...
*
*/
function nextcron() {
$nextrun = DB::result_first("SELECT nextrun FROM ".DB::table('common_cron')." WHERE available>'0' ORDER BY nextrun LIMIT 1");
if($nextrun !== FALSE) {
save_syscache('cronnextrun', $nextrun);
} else {
save_syscache('cronnextrun', TIMESTAMP + 86400 * 365);
}
return true;
}
/**
* 设定某个计划任务下次执行时间
*
* @param array $cron
* @return true
*/
function setnextime($cron) {
global $_G;
if(empty($cron)) return FALSE;
list($yearnow, $monthnow, $daynow, $weekdaynow, $hournow, $minutenow) = explode('-', gmdate('Y-m-d-w-H-i', TIMESTAMP + $_G['setting']['timeoffset'] * 3600));
if($cron['weekday'] == -1) {
if($cron['day'] == -1) {
$firstday = $daynow;
$secondday = $daynow + 1;
} else {
$firstday = $cron['day'];
$secondday = $cron['day'] + gmdate('t', TIMESTAMP + $_G['setting']['timeoffset'] * 3600);
}
} else {
$firstday = $daynow + ($cron['weekday'] - $weekdaynow);
$secondday = $firstday + 7;
}
if($firstday < $daynow) {
$firstday = $secondday;
}
if($firstday == $daynow) {
$todaytime = discuz_cron::todaynextrun($cron);
if($todaytime['hour'] == -1 && $todaytime['minute'] == -1) {
$cron['day'] = $secondday;
$nexttime = discuz_cron::todaynextrun($cron, 0, -1);
$cron['hour'] = $nexttime['hour'];
$cron['minute'] = $nexttime['minute'];
} else {
$cron['day'] = $firstday;
$cron['hour'] = $todaytime['hour'];
$cron['minute'] = $todaytime['minute'];
}
} else {
$cron['day'] = $firstday;
$nexttime = discuz_cron::todaynextrun($cron, 0, -1);
$cron['hour'] = $nexttime['hour'];
$cron['minute'] = $nexttime['minute'];
}
$nextrun = @gmmktime($cron['hour'], $cron['minute'] > 0 ? $cron['minute'] : 0, 0, $monthnow, $cron['day'], $yearnow) - $_G['setting']['timeoffset'] * 3600;
$availableadd = $nextrun TIMESTAMP ? '' : ', available=\'0\'';
DB::query("UPDATE ".DB::table('common_cron')." SET lastrun='$_G[timestamp]', nextrun='$nextrun' $availableadd WHERE cronid='$cron[cronid]'");
return true;
}
/**
* 计算计划任务今日执行状态
*
* @param int $cron
* @param int $hour
* @param int $minute
* @return int
*/
function todaynextrun($cron, $hour = -2, $minute = -2) {
global $_G;
$hour = $hour == -2 ? gmdate('H', TIMESTAMP + $_G['setting']['timeoffset'] * 3600) : $hour;
$minute = $minute == -2 ? gmdate('i', TIMESTAMP + $_G['setting']['timeoffset'] * 3600) : $minute;
$nexttime = array();
if($cron['hour'] == -1 && !$cron['minute']) {
$nexttime['hour'] = $hour;
$nexttime['minute'] = $minute + 1;
} elseif($cron['hour'] == -1 && $cron['minute'] != '') {
$nexttime['hour'] = $hour;
if(($nextminute = discuz_cron::nextminute($cron['minute'], $minute)) === false) {
++$nexttime['hour'];
$nextminute = $cron['minute'][0];
}
$nexttime['minute'] = $nextminute;
} elseif($cron['hour'] != -1 && $cron['minute'] == '') {
if($cron['hour'] < $hour) {
$nexttime['hour'] = $nexttime['minute'] = -1;
} elseif($cron['hour'] == $hour) {
$nexttime['hour'] = $cron['hour'];
$nexttime['minute'] = $minute + 1;
} else {
$nexttime['hour'] = $cron['hour'];
$nexttime['minute'] = 0;
}
} elseif($cron['hour'] != -1 && $cron['minute'] != '') {
$nextminute = discuz_cron::nextminute($cron['minute'], $minute);
if($cron['hour'] < $hour || ($cron['hour'] == $hour && $nextminute === false)) {
$nexttime['hour'] = -1;
$nexttime['minute'] = -1;
} else {
$nexttime['hour'] = $cron['hour'];
$nexttime['minute'] = $nextminute;
}
}
return $nexttime;
}
/**
* 计算计划任务执行时刻
*
* @param int $nextminutes
* @param int $minutenow
* @return int
*/
function nextminute($nextminutes, $minutenow) {
foreach($nextminutes as $nextminute) {
if($nextminute > $minutenow) {
return $nextminute;
}
}
return false;
}
}
/**
* 功能进程管理
* 通常用于某些功能禁止?⒎⒃诵?
*
*/
class discuz_process
{
/**
* 获取某进程信息
*
* @param string $name 进程名字
* @return array
*/
function get($name) {
$name5 = md5($name);
$res = DB::fetch_first("SELECT * FROM ".DB::table('common_process')." WHERE processid='$name5'");
if(empty($res)) {
$res = array();
} elseif($res['expiry'] < TIMESTAMP) {
discuz_process::delete($name);
$res = array();
}
return $res;
}
/**
* 创建进程
*
* @param string $name 进程名
* @param int $lifespan 进程过期时间
* @param int $extra 进程附属信息
* @return boolean
*/
function create($name, $lifespan = 0, $extra = 0) {
$check = discuz_process::get($name);
if(empty($check)) {
$lifespan = empty($lifespan) ? 600 : $lifespan;
DB::insert('common_process', array(
'processid' => md5($name),
'expiry' = TIMESTAMP + $lifespan,
'extra' =$extra), false, true);
return true;
}
else {
return false;
}
}
/**
* 删除某个进程或过期进程
*
* @param string $name 进程名
*/
function delete($name = '') {
$name = md5($name);
DB::delete('common_process', "processid='$name' OR expiry<".TIMESTAMP);
}
}
/**
* Discuz 内存读写引擎
* 支持 memcache, eAccelerator, XCache
*
* 使用的时候建议直接利用函数 memory()
*/
class discuz_memory
{
var $config;
var $extension = array();
var $memory;
var $prefix;
var $type;
var $keys;
var $enable = false;
/**
* 确认当前系统支持的内存读写接口
* @return discuz_memory
*/
function discuz_memory() {
$this->extension['eaccelerator'] = extension_loaded('eAccelerator');
$this->extension['xcache'] = extension_loaded('XCache');
$this->extension['memcache'] = extension_loaded('memcache');
}
/**
* 依据config当中设置，初始化内存引擎
* @param unknown_type $config
*/
function init($config) {
$this->config = $config;<span style="font-family: Courier New;"><span style="color: #007700;"> </span><span style="color: #ff8000;">//这里的$config能追溯到discuz_core的构造函数，就是把config_global.php的数据加载进来</span></span>
$this->prefix = empty($config['prefix']) ? substr(md5($_SERVER['HTTP_HOST']), 0, 6).'_' : $config['prefix'];
$this->keys = array();
// memcache 接口
if($this->extension['memcache'] && !empty($config['memcache']['server'])) {
require_once libfile('class/memcache');
$this->memory = new discuz_memcache();
$this->memory->init($this->config['memcache']);
if(!$this->memory->enable) {
$this->memory = null;
}
}
// eaccelerator 接口
if(!is_object($this->memory) && $this->extension['eaccelerator'] && $this->config['eaccelerator']) {
require_once libfile('class/eaccelerator');
$this->memory = new discuz_eaccelerator();
$this->memory->init(null);
}
// xcache 接口
if(!is_object($this->memory) && $this->extension['xcache'] && $this->config['xcache']) {
require_once libfile('class/xcache');
$this->memory = new discuz_xcache();
$this->memory->init(null);
}
// 当接口正常，引入当前已经缓存的变量数组
if(is_object($this->memory)) {
$this->enable = true;
$this->type = str_replace('discuz_', '', get_class($this->memory));
$this->keys = $this->get('memory_system_keys');
$this->keys = !is_array($this->keys) ? array() : $this->keys;
}
}
/**
* 读取内存
*
* @param string $key
* @return mix
*/
function get($key) {
$ret = null;
if($this->enable && (isset($this->keys[$key]) || $key == 'memory_system_keys')) {
$ret = $this->memory->get($this->_key($key));
if(!is_array($ret)) {
$ret = null;
} else {
return $ret[0];
}
}
return $ret;
}
/**
* 写入内存
*
* @param string $key
* @param array_string_number $value
* @param int过期时间 $ttl
* @return boolean
*/
function set($key, $value, $ttl = 0) {
$ret = null;
if($this->enable) {
$ret = $this->memory->set($this->_key($key), array($value), $ttl);
if($ret) {
$this->keys[$key] = true;
$this->memory->set($this->_key('memory_system_keys'), array($this->keys));
}
}
return $ret;
}
/**
* 删除一个内存单元
* @param 键值string $key
* @return boolean
*/
function rm($key) {
$ret = null;
if($this->enable) {
$ret = $this->memory->rm($this->_key($key));
if($ret) {
unset($this->keys[$key]);
$this->memory->set($this->_key('memory_system_keys'), array($this->keys));
}
}
return $ret;
}
/**
* 清除当前使用的所有内存
*/
function clear() {
if($this->enable && is_array($this->keys)) {
$this->keys['memory_system_keys'] = true;
foreach ($this->keys as $k = $v) {
$this->memory->rm($this->_key($k));
}
}
$this->keys = array();
return true;
}
/**
* 内部函数 追加键值前缀
* @param string $str
* @return boolean
*/
function _key($str) {
return ($this->prefix).$str;
}
}
作者“pz9042”
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