PHP 获取IP 并根据IP获取 城市省份等信息

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

function getIp(){
if (@$_SERVER['HTTP_CLIENT_IP'] && $_SERVER['HTTP_CLIENT_IP']!='unknown') {
$ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (@$_SERVER['HTTP_X_FORWARDED_FOR'] && $_SERVER['HTTP_X_FORWARDED_FOR']!='unknown') {
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
$ip = $_SERVER['REMOTE_ADDR'];
}
return $ip;
}

//根据IP获取当前城市
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;
}