PHP实现获取客户端IP并获取IP信息

<?php
/**
 * 获取客户端IP
 * @param  integer $type 返回类型 0:string,1:long
 * @return string|long
 */
function getClientIp($type = 0) {
    $ip = NULL;
    if (isset($_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];
    }
    $long = sprintf("%u", ip2long($ip));
    $ip   = $long ? array($ip, $long) : array(0.0.0.0, 0);
    return $ip[$type];
}
/**
 * 获取IP信息
 * @param  string|long $ip  IP地址
 * @return array
 */
function getIpInfo($ip)
{
    if (is_long($ip)) {
        $ip = long2ip($ip);
    }
    $api = http://ip.taobao.com/service/getIpInfo.php;
    $ret = file_get_contents($api . ?ip= . $ip);
    $ret = json_decode($ret, true);
    if ($ret[code] == 0) {
        return $ret[data];
    }
    return array();
}