获取当前IP地址，跳转到对应城市网站

1，通过获取当前IP地址
2，调用新浪AIP，获取到当前城市

3，将中文转换为拼音后跳转

<?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;