How does PHP get the code instance of the region where the IP belongs (pure code)

The content of this article is about how PHP obtains code examples (pure code) of the IP region. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

$ip=get_client_ip();if(!preg_match("/^[\d]+\.[\d]+\.[\d]+\.[\d]+$/isU",$ip)){    
echo "IP地址错误";
}else{    
//淘宝IP接口
    $url='http://ip.taobao.com/service/getIpInfo.php?ip='.$ip;  
    $result = file_get_contents($url);  
    $result = json_decode($result,true);  
    if($result['code']!==0 || !is_array($result['data'])){        
    echo "IP地址错误";
    }else{
        print_r($result);
    }
}/**
 * 获取客户端IP地址
 * @param integer $type 返回类型 0 返回IP地址 1 返回IPV4地址数字
 * @param boolean $adv 是否进行高级模式获取（有可能被伪装） 
 * @return mixed
 */function get_client_ip($type = 0,$adv=true) {
    $type       =  $type ? 1 : 0;    static $ip  =   NULL;    
    if ($ip !== NULL) return $ip[$type];    
    if($adv){        
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {            
    $arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);            
    $pos    =   array_search('unknown',$arr);            
    if(false !== $pos) unset($arr[$pos]);            
    $ip     =   trim($arr[0]);
        }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {            
        $ip     =   $_SERVER['HTTP_CLIENT_IP'];
        }elseif (isset($_SERVER['REMOTE_ADDR']))
         {            
        $ip     =   $_SERVER['REMOTE_ADDR'];
        }
    }elseif (isset($_SERVER['REMOTE_ADDR'])) {        
    $ip     =   $_SERVER['REMOTE_ADDR'];
    }    
    // IP地址合法验证
    $long = sprintf("%u",ip2long($ip));    
    $ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);    
    return $ip[$type];
}

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