UCHome中关于公共函数(function_common.php)页面的代码分析(一)

<?php 
/* 
    [UCenter Home] (C) 2007-2008 Comsenz Inc. 
    $Id: function_common.php 2009-10-20 21:12:00 
    @author ymaozi 
    @copyright http://www.codedesign.cn/ 
    @uchome源码交流ＱＱ群：83400263 
*/
  
if(!defined('IN_UCHOME')) { 
    exit('Access Denied'); 
} 
/** 
 * SQL ADDSLASHES 对sql的一些字符进行转义 
 * @param string or array $string 
 * @return string or array 
 */
function saddslashes($string) { 
    if(is_array($string)) { //如果转入的是数组则对数组中的value进行递归转义 
        foreach($string as $key => $val) { 
            $string[$key] = saddslashes($val); 
        } 
    } else { 
        $string = addslashes($string); //对单引号（'）、双引号（"）、反斜线（\）与 NUL（NULL 字符），进行转义 
    } 
    return $string; 
} 
  
/** 
 * 取消HTML代码 
 * @param string or array $string 
 * @return string or array 
 */
function shtmlspecialchars($string) { 
    if(is_array($string)) { 
        foreach($string as $key => $val) { 
            $string[$key] = shtmlspecialchars($val); 
        } 
    } else { 
        $string = preg_replace('/&((#(\d{3,5}|x[a-fA-F0-9]{4})|[a-zA-Z][a-z0-9]{2,5});)/', '&\\1', 
            str_replace(array('&', '"', '<', '>'), array('&', '"', '<', '>'), $string));//将传入的html中的&,",<,>,进行替换 
    } 
    return $string; 
}

/** 
 * 清空cookie与一些判断用户登录的信息 
 */
function clearcookie() { 
    global $_SGLOBAL; 
  
    obclean(); //清除缓存 
    ssetcookie('auth', '', -86400 * 365); //设置cookie名为auth的过期 
    $_SGLOBAL['supe_uid'] = 0; 
    $_SGLOBAL['supe_username'] = ''; 
    $_SGLOBAL['member'] = array(); //将这些全局变量清空 
} 
  
//cookie设置 
/** 
 * 设置cookie 
 * @param   string  cookie名 
 * @param   string  cookie值 
 * @param   int     cookie存储时间 
 * @return void 
 */
function ssetcookie($var, $value, $life=0) { 
    global $_SGLOBAL, $_SC, $_SERVER; 
    setcookie($_SC['cookiepre'].$var, $value, $life?($_SGLOBAL['timestamp']+$life):0, $_SC['cookiepath'], $_SC['cookiedomain'], $_SERVER['SERVER_PORT']==443?1:0); 
} 
  
// 
/** 
 * 创建数据库连接对象 
 */
function dbconnect() { 
    global $_SGLOBAL, $_SC; 
  
    include_once(S_ROOT.'./source/class_mysql.php'); //引入数据库操作类 
  
    if(empty($_SGLOBAL['db'])) { //如果没有创建数据库对象，则创建 
        $_SGLOBAL['db'] = new dbstuff; 
        $_SGLOBAL['db']->charset = $_SC['dbcharset']; 
        $_SGLOBAL['db']->connect($_SC['dbhost'], $_SC['dbuser'], $_SC['dbpw'], $_SC['dbname'], $_SC['pconnect']); 
    } 
} 
  
//获取在线IP 
function getonlineip($format=0) { 
    global $_SGLOBAL; 
  
    if(empty($_SGLOBAL['onlineip'])) { 
        if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) { 
            //如果存在客户端ip,并通过strcasecmp(),比较不等于unknown,则获取客户端ip 
                        $onlineip = getenv('HTTP_CLIENT_IP'); 
        } elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) { 
            //如果存在代理ip,则获取代理ip 
                        $onlineip = getenv('HTTP_X_FORWARDED_FOR'); 
        } elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) { 
            //代理服务器 IP 
                        $onlineip = getenv('REMOTE_ADDR'); 
        } elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) { 
            $onlineip = $_SERVER['REMOTE_ADDR']; 
        } 
        preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches); 
                //通过正则检验，是否是ip地址的格式 
        $_SGLOBAL['onlineip'] = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown'; 
    } 
    if($format) { 
        $ips = explode('.', $_SGLOBAL['onlineip']); //将ip地址，以.为分隔存入到数组 
        for($i=0;$i<3;$i++) { 
            $ips[$i] = intval($ips[$i]); 
        } 
        return sprintf('%03d%03d%13d', $ips[0], $ips[1], $ips[2]);//返回ip地十的前三段,03d：三位整数，如果不足刚以0填充 
    } else { 
        return $_SGLOBAL['onlineip']; 
    } 
} 
  
// 
/** 
 * 判断当前用户登录状态 
 */
function checkauth() { 
    global $_SGLOBAL, $_SC, $_SCONFIG, $_SCOOKIE, $_SN; 
  
    if($_SGLOBAL['mobile'] && $_GET['m_auth']) $_SCOOKIE['auth'] = $_GET['m_auth']; 
    if($_SCOOKIE['auth']) { //如果设置了名了auth的cookie 
        @list($password, $uid) = explode("\t", authcode($_SCOOKIE['auth'], 'DECODE')); //通过authcode()函数将加密过的auth进行解密，将解密的信息分别存在$password与$uid中 
        $_SGLOBAL['supe_uid'] = intval($uid); //将$uid设置给全局的supe_uid 
        if($password && $_SGLOBAL['supe_uid']) { //如果密码与uid都存在，则判断用户信息的正确性 
            $query = $_SGLOBAL['db']->query("SELECT * FROM ".tname('session')." WHERE uid='$_SGLOBAL[supe_uid]'"); 
            if($member = $_SGLOBAL['db']->fetch_array($query)) { 
                if($member['password'] == $password) { 
                    $_SGLOBAL['supe_username'] = addslashes($member['username']); 
                    $_SGLOBAL['session'] = $member; 
                } else { 
                    $_SGLOBAL['supe_uid'] = 0; 
                } 
            } else {//如果用户表中不存在该用户，则到用户表中查找 
                $query = $_SGLOBAL['db']->query("SELECT * FROM ".tname('member')." WHERE uid='$_SGLOBAL[supe_uid]'"); 
                if($member = $_SGLOBAL['db']->fetch_array($query)) { 
                    if($member['password'] == $password) { 
                        $_SGLOBAL['supe_username'] = addslashes($member['username']); 
                        $session = array('uid' => $_SGLOBAL['supe_uid'], 'username' => $_SGLOBAL['supe_username'], 'password' => $password); 
                        include_once(S_ROOT.'./source/function_space.php'); 
                        insertsession($session);//将信息插入到session表中 
                    } else { 
                        $_SGLOBAL['supe_uid'] = 0; 
                    } 
                } else { 
                    $_SGLOBAL['supe_uid'] = 0; 
                } 
            } 
        } 
    } 
    if(empty($_SGLOBAL['supe_uid'])) { 
                //如果supe_uid为空，则清除cookie 
        clearcookie(); 
    } else { 
        $_SGLOBAL['username'] = $member['username']; 
    } 
}

posted on 2010-05-11 13:39 小炒花生米阅读(615) 评论(0) 编辑收藏举报

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UCHome中关于公共函数(function_common.php)页面的代码分析(一)

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