借用SINA IP地址库取用户所在城市及地区 PHP版

<?php
/*$ip=real_ip();
$url='http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip='.$ip;
$content=fopen_url($url);
$Exp='/country":"(.*?)","province":"(.*?)","city":"(.*?)","district":"","isp":"(.*?)","type/s';
$content=unicodeDecode( $content );
if(preg_match($Exp,$content,$matche)){
echo 'Hello,来自'.$matche[1].$matche[2].$matche[3].'的朋友.';
}elseif(preg_match('/"ret":-1,"ip":"(.*?)"/',$content,$matche)){
echo '您使用的是局域网,局域网IP为'.$matche[1];
}else{
echo '你来自火星吧。';
}*/

/**
 *
 */
function ipFunGetCityNameById(){
    $url='http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip='.ipFunReal_ip();
    $content=ipFunFopen_url($url);
    $Exp='/country":"(.*?)","province":"(.*?)","city":"(.*?)","district":"","isp":"(.*?)","type/s';
    $content=ipFunUnicodeDecode( $content );
    if(preg_match($Exp,$content,$matche)){
        return $matche[3];
    }else
        return "";
}
 
 
//Curl 获取网址内容
function ipFunFopen_url($url)
{
    if (function_exists('file_get_contents')) {
        $file_content = @file_get_contents($url);
    } elseif (ini_get('allow_url_fopen') && ($file = @fopen($url, 'rb'))){
        $i = 0;
        while (!feof($file) && $i++ < 1000) {
            $file_content .= strtolower(fread($file, 4096));
        }
        fclose($file);
    } elseif (function_exists('curl_init')) {
        $curl_handle = curl_init();
        curl_setopt($curl_handle, CURLOPT_URL, $url);
        curl_setopt($curl_handle, CURLOPT_CONNECTTIMEOUT,2);
        curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER,1);
        curl_setopt($curl_handle, CURLOPT_FAILONERROR,1);
        curl_setopt($curl_handle, CURLOPT_USERAGENT, 'Trackback Spam Check');
        $file_content = curl_exec($curl_handle);
        curl_close($curl_handle);
    } else {
        $file_content = '';
    }
    return $file_content;
}
 
function ipFunUnicodeDecode($content)
{
    // 转换编码，将Unicode编码转换gb2312编码
    $pattern = '/(\\\u([\w]{4}))/i';
    preg_match_all($pattern, $content, $matches);
    if (!empty($matches))
    {
        for ($j = 0; $j < count($matches[0]); $j++)
        {
            $str = $matches[0][$j];
            if (strpos($str, '\\u') === 0)
            {
                $code = base_convert(substr($str, 2, 2), 16, 10);
                $code2 = base_convert(substr($str, 4), 16, 10);
 
                $c = chr($code).chr($code2);
                $c=mb_convert_encoding($c, "UTF-8", 'UCS-2');
                //$c = iconv('UCS-2', 'gb2312', $c);
                $content=str_replace($matches[0][$j],$c,$content);
            }
            else
            {
                $content .= $str;
            }
        }
    }
    return $content;
}
 
function ipFunReal_ip()
{
    static $realip = NULL;
 
    if ($realip !== NULL)
    {
        return $realip;
    }
 
    if (isset($_SERVER))
    {
        if (isset($_SERVER['HTTP_X_FORWARDED_FOR']))
        {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
 
            /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */
            foreach ($arr AS $ip)
            {
                $ip = trim($ip);
 
                if ($ip != 'unknown')
                {
                    $realip = $ip;
 
                    break;
                }
            }
        }
        elseif (isset($_SERVER['HTTP_CLIENT_IP']))
        {
            $realip = $_SERVER['HTTP_CLIENT_IP'];
        }
        else
        {
            if (isset($_SERVER['REMOTE_ADDR']))
            {
                $realip = $_SERVER['REMOTE_ADDR'];
            }
            else
            {
                $realip = '0.0.0.0';
            }
        }
    }
    else
    {
        if (getenv('HTTP_X_FORWARDED_FOR'))
        {
            $realip = getenv('HTTP_X_FORWARDED_FOR');
        }
        elseif (getenv('HTTP_CLIENT_IP'))
        {
            $realip = getenv('HTTP_CLIENT_IP');
        }
        else
        {
            $realip = getenv('REMOTE_ADDR');
        }
    }
 
    preg_match("/[\d\.]{7,15}/", $realip, $onlineip);
    $realip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';
 
    return $realip;
}