获取当前IP地址，跳转到对应城市网站。

博客迁移：时空蚂蚁http://cui.cuihongbo.com/

1. [代码]index.php

<?php
    include './pinyin.php';

    //获取当前ip
    function getIp(){
        $onlineip='';
        if(getenv('HTTP_CLIENT_IP')&&strcasecmp(getenv('HTTP_CLIENT_IP'),'unknown')){
            $onlineip=getenv('HTTP_CLIENT_IP');
        } elseif(getenv('HTTP_X_FORWARDED_FOR')&&strcasecmp(getenv('HTTP_X_FORWARDED_FOR'),'unknown')){
            $onlineip=getenv('HTTP_X_FORWARDED_FOR');
        } elseif(getenv('REMOTE_ADDR')&&strcasecmp(getenv('REMOTE_ADDR'),'unknown')){
            $onlineip=getenv('REMOTE_ADDR');
        } elseif(isset($_SERVER['REMOTE_ADDR'])&&$_SERVER['REMOTE_ADDR']&&strcasecmp($_SERVER['REMOTE_ADDR'],'unknown')){
            $onlineip=$_SERVER['REMOTE_ADDR'];
        }
        return $onlineip;
    }

    //获取城市信息api
    function getLocation($ip){
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, "http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=".$ip);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 30);
        $str = curl_exec($curl);
        curl_close($curl);
        return $str;
    }
    
    //当前ip地址
    $currentIP = getIp();
    
    //通过当前ip获取信息
    $getLocation = getLocation($currentIP);
    $currentInfo = json_decode($getLocation, true);    
    
    //判断ip是否为有效
    if($currentInfo['ret'] == '-1')
    {
        $currentInfo['city'] = 'unknown';
    }
    
    //当前城市中文名
    $currentCityName = $currentInfo['city'];        
    $currentCityEName = $pin->Pinyin("$currentCityName",'UTF8');
    
    //城市拼音多音字
    switch($currentCityEName)
    {
        case 'zhongqing':
            $currentCityEName = 'chongqing';
        break;
        
        case 'shenfang':
            $currentCityEName = 'shifang';
        break;
        
        case 'chengdou':
            $currentCityEName = 'chengdu';
        break;
        
        case 'yueshan':
            $currentCityEName = 'leshan';
        break;
        
        case 'junxian':
            $currentCityEName = 'xunxian'; 
        break;
        
        case 'shamen':
            $currentCityEName = 'xiamen'; 
        break;
        
        case 'zhangsha':
            $currentCityEName = 'changsha'; 
        break;
        
        case 'weili':
            $currentCityEName = 'yuli'; 
        break;
        
        case 'zhaoyang':
            $currentCityEName = 'chaoyang'; 
        break;
        
        case 'danxian':
            $currentCityEName = 'shanxian'; 
        break;
        
        default:
            $currentCityEName = $pin->Pinyin("$currentCityName",'UTF8');
        break;
    }
    
    //重定向浏览器 
    header("Location: http://www.huanhang.com/?city=$currentCityEName"); 
    exit;

2. [代码]pinyin.php 

<?php
// 这里在OSC上找了别人分享的中文转换成拼音的一段代码。
class pin{
    function Pinyin($_String, $_Code='gb2312'){
        
        $_DataKey = "a|ai|an|ang|ao|ba|bai|ban|bang|bao|bei|ben|beng|bi|bian|biao|bie|bin|bing|bo|bu|ca|cai|can|cang|cao|ce|ceng|cha".
                    "|chai|chan|chang|chao|che|chen|cheng|chi|chong|chou|chu|chuai|chuan|chuang|chui|chun|chuo|ci|cong|cou|cu|".
                    "cuan|cui|cun|cuo|da|dai|dan|dang|dao|de|deng|di|dian|diao|die|ding|diu|dong|dou|du|duan|dui|dun|duo|e|en|er".
                    "|fa|fan|fang|fei|fen|feng|fo|fou|fu|ga|gai|gan|gang|gao|ge|gei|gen|geng|gong|gou|gu|gua|guai|guan|guang|gui".
                    "|gun|guo|ha|hai|han|hang|hao|he|hei|hen|heng|hong|hou|hu|hua|huai|huan|huang|hui|hun|huo|ji|jia|jian|jiang".
                    "|jiao|jie|jin|jing|jiong|jiu|ju|juan|jue|jun|ka|kai|kan|kang|kao|ke|ken|keng|kong|kou|ku|kua|kuai|kuan|kuang".
                    "|kui|kun|kuo|la|lai|lan|lang|lao|le|lei|leng|li|lia|lian|liang|liao|lie|lin|ling|liu|long|lou|lu|lv|luan|lue".
                    "|lun|luo|ma|mai|man|mang|mao|me|mei|men|meng|mi|mian|miao|mie|min|ming|miu|mo|mou|mu|na|nai|nan|nang|nao|ne".
                    "|nei|nen|neng|ni|nian|niang|niao|nie|nin|ning|niu|nong|nu|nv|nuan|nue|nuo|o|ou|pa|pai|pan|pang|pao|pei|pen".
                    "|peng|pi|pian|piao|pie|pin|ping|po|pu|qi|qia|qian|qiang|qiao|qie|qin|qing|qiong|qiu|qu|quan|que|qun|ran|rang".
                    "|rao|re|ren|reng|ri|rong|rou|ru|ruan|rui|run|ruo|sa|sai|san|sang|sao|se|sen|seng|sha|shai|shan|shang|shao|".
                    "she|shen|sheng|shi|shou|shu|shua|shuai|shuan|shuang|shui|shun|shuo|si|song|sou|su|suan|sui|sun|suo|ta|tai|".
                    "tan|tang|tao|te|teng|ti|tian|tiao|tie|ting|tong|tou|tu|tuan|tui|tun|tuo|wa|wai|wan|wang|wei|wen|weng|wo|wu".
                    "|xi|xia|xian|xiang|xiao|xie|xin|xing|xiong|xiu|xu|xuan|xue|xun|ya|yan|yang|yao|ye|yi|yin|ying|yo|yong|you".
                    "|yu|yuan|yue|yun|za|zai|zan|zang|zao|ze|zei|zen|zeng|zha|zhai|zhan|zhang|zhao|zhe|zhen|zheng|zhi|zhong|".
                    "zhou|zhu|zhua|zhuai|zhuan|zhuang|zhui|zhun|zhuo|zi|zong|zou|zu|zuan|zui|zun|zuo";
                    
        $_DataValue = "-20319|-20317|-20304|-20295|-20292|-20283|-20265|-20257|-20242|-20230|-20051|-20036|-20032|-20026|-20002|-19990".
                    "|-19986|-19982|-19976|-19805|-19784|-19775|-19774|-19763|-19756|-19751|-19746|-19741|-19739|-19728|-19725".
                    "|-19715|-19540|-19531|-19525|-19515|-19500|-19484|-19479|-19467|-19289|-19288|-19281|-19275|-19270|-19263".
                    "|-19261|-19249|-19243|-19242|-19238|-19235|-19227|-19224|-19218|-19212|-19038|-19023|-19018|-19006|-19003".
                    "|-18996|-18977|-18961|-18952|-18783|-18774|-18773|-18763|-18756|-18741|-18735|-18731|-18722|-18710|-18697".
                    "|-18696|-18526|-18518|-18501|-18490|-18478|-18463|-18448|-18447|-18446|-18239|-18237|-18231|-18220|-18211".
                    "|-18201|-18184|-18183|-18181|-18012|-17997|-17988|-17970|-17964|-17961|-17950|-17947|-17931|-17928|-17922".
                    "|-17759|-17752|-17733|-17730|-17721|-17703|-17701|-17697|-17692|-17683|-17676|-17496|-17487|-17482|-17468".
                    "|-17454|-17433|-17427|-17417|-17202|-17185|-16983|-16970|-16942|-16915|-16733|-16708|-16706|-16689|-16664".
                    "|-16657|-16647|-16474|-16470|-16465|-16459|-16452|-16448|-16433|-16429|-16427|-16423|-16419|-16412|-16407".
                    "|-16403|-16401|-16393|-16220|-16216|-16212|-16205|-16202|-16187|-16180|-16171|-16169|-16158|-16155|-15959".
                    "|-15958|-15944|-15933|-15920|-15915|-15903|-15889|-15878|-15707|-15701|-15681|-15667|-15661|-15659|-15652".
                    "|-15640|-15631|-15625|-15454|-15448|-15436|-15435|-15419|-15416|-15408|-15394|-15385|-15377|-15375|-15369".
                    "|-15363|-15362|-15183|-15180|-15165|-15158|-15153|-15150|-15149|-15144|-15143|-15141|-15140|-15139|-15128".
                    "|-15121|-15119|-15117|-15110|-15109|-14941|-14937|-14933|-14930|-14929|-14928|-14926|-14922|-14921|-14914".
                    "|-14908|-14902|-14894|-14889|-14882|-14873|-14871|-14857|-14678|-14674|-14670|-14668|-14663|-14654|-14645".
                    "|-14630|-14594|-14429|-14407|-14399|-14384|-14379|-14368|-14355|-14353|-14345|-14170|-14159|-14151|-14149".
                    "|-14145|-14140|-14137|-14135|-14125|-14123|-14122|-14112|-14109|-14099|-14097|-14094|-14092|-14090|-14087".
                    "|-14083|-13917|-13914|-13910|-13907|-13906|-13905|-13896|-13894|-13878|-13870|-13859|-13847|-13831|-13658".
                    "|-13611|-13601|-13406|-13404|-13400|-13398|-13395|-13391|-13387|-13383|-13367|-13359|-13356|-13343|-13340".
                    "|-13329|-13326|-13318|-13147|-13138|-13120|-13107|-13096|-13095|-13091|-13076|-13068|-13063|-13060|-12888".
                    "|-12875|-12871|-12860|-12858|-12852|-12849|-12838|-12831|-12829|-12812|-12802|-12607|-12597|-12594|-12585".
                    "|-12556|-12359|-12346|-12320|-12300|-12120|-12099|-12089|-12074|-12067|-12058|-12039|-11867|-11861|-11847".
                    "|-11831|-11798|-11781|-11604|-11589|-11536|-11358|-11340|-11339|-11324|-11303|-11097|-11077|-11067|-11055".
                    "|-11052|-11045|-11041|-11038|-11024|-11020|-11019|-11018|-11014|-10838|-10832|-10815|-10800|-10790|-10780".
                    "|-10764|-10587|-10544|-10533|-10519|-10331|-10329|-10328|-10322|-10315|-10309|-10307|-10296|-10281|-10274".
                    "|-10270|-10262|-10260|-10256|-10254";
                    
        $_TDataKey = explode('|', $_DataKey);
        $_TDataValue = explode('|', $_DataValue);
        $_Data = (PHP_VERSION>='5.0') ? array_combine($_TDataKey, $_TDataValue) : $this->Arr_Combine($_TDataKey, $_TDataValue);
        arsort($_Data);
        reset($_Data);
        if($_Code != 'gb2312') $_String = $this->U2_Utf8_Gb($_String);
        $_Res = '';
        for($i=0; $i<strlen($_String); $i++){
            $_P = ord(substr($_String, $i, 1));
            if($_P>160) { $_Q = ord(substr($_String, ++$i, 1)); $_P = $_P*256 + $_Q - 65536; }
            $_Res .= $this->Pinyins($_P, $_Data);
        }
        return $_Res;
    }
        
    function Pinyins($_Num, $_Data){
        if ($_Num>0 && $_Num<160 ) return chr($_Num);
            elseif($_Num<-20319 || $_Num>-10247) return '';
        else {
            foreach($_Data as $k=>$v){ if($v<=$_Num) break; }
            return $k;
        }
    }
    function U2_Utf8_Gb($_C){
        $_String = '';
        if($_C < 0x80){ 
            $_String .= $_C;
        }elseif($_C < 0x800){
            $_String .= chr(0xC0 | $_C>>6);
            $_String .= chr(0x80 | $_C & 0x3F);
        }elseif($_C < 0x10000){
            $_String .= chr(0xE0 | $_C>>12);
            $_String .= chr(0x80 | $_C>>6 & 0x3F);
            $_String .= chr(0x80 | $_C & 0x3F);
        }elseif($_C < 0x200000) {
            $_String .= chr(0xF0 | $_C>>18);
            $_String .= chr(0x80 | $_C>>12 & 0x3F);
            $_String .= chr(0x80 | $_C>>6 & 0x3F);
            $_String .= chr(0x80 | $_C & 0x3F);
        }
            return iconv('UTF-8', 'GB2312', $_String);
        }
    function Arr_Combine($_Arr1, $_Arr2){
        for($i=0; $i<count($_Arr1); $i++) $_Res[$_Arr1[$i]] = $_Arr2[$i];
        return $_Res;
    }
}
$pin = new pin();
$pin->Pinyin('北京','UTF8');

来自：http://www.oschina.net/code/snippet_31937_33850#48822