PHP 根据IP地址获取所在城市

<?php  

header('Content-Type:text/html;Charset=utf-8');  

function GetIp(){  

    $realip = '';  

    $unknown = 'unknown';  

    if (isset($_SERVER)){  

        if(isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)){  

            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);  

            foreach($arr as $ip){  

                $ip = trim($ip);  

                if ($ip != 'unknown'){  

                    $realip = $ip;  

                    break;  

                }  

            }  

        }else if(isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)){  

            $realip = $_SERVER['HTTP_CLIENT_IP'];  

        }else if(isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)){  

            $realip = $_SERVER['REMOTE_ADDR'];  

        }else{  

            $realip = $unknown;  

        }  

    }else{  

        if(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)){  

            $realip = getenv("HTTP_X_FORWARDED_FOR");  

        }else if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)){  

            $realip = getenv("HTTP_CLIENT_IP");  

        }else if(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)){  

            $realip = getenv("REMOTE_ADDR");  

        }else{  

            $realip = $unknown;  

        }  

    }  

    $realip = preg_match("/[\d\.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;  

    return $realip;  

}  

  

function GetIpLookup($ip = ''){  

    if(empty($ip)){  

        $ip = GetIp();  

    }  

    $res = @file_get_contents('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' . $ip);  

    if(empty($res)){ return false; }  

    $jsonMatches = array();  

    preg_match('#\{.+?\}#', $res, $jsonMatches);  

    if(!isset($jsonMatches[0])){ return false; }  

    $json = json_decode($jsonMatches[0], true);  

    if(isset($json['ret']) && $json['ret'] == 1){  

        $json['ip'] = $ip;  

        unset($json['ret']);  

    }else{  

        return false;  

    }  

    return $json;  

}  

  

  

$ipInfos = GetIpLookup('123.125.114.144'); //baidu.com IP地址  

var_dump($ipInfos);
 

结果截图：



使用了新浪的开放API，执行速度还是非常赞的。