PHP 快速獲取客戶端IP地址及ip歸屬地

一、獲取客戶端ip地址

function getClientIp(){
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
        $ip = getenv("HTTP_CLIENT_IP");
    else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
        $ip = getenv("HTTP_X_FORWARDED_FOR");
    else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
        $ip = getenv("REMOTE_ADDR");
    else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
        $ip = $_SERVER['REMOTE_ADDR'];
    else
        $ip = "unknown";
    return($ip);
}

二、獲取ip歸屬地

function getIpCity(string $ip = '')
{
	// 可以自己找第三方接口，返回數據不一樣
    $url = "http://whois.pconline.com.cn/ip.jsp?ip=".$ip;
    $res = file_get_contents($url);
    // 因爲這個接口返回的值gb2312編碼，且有換行符，所以做以下處理
    return preg_replace("/\s/","", iconv("gb2312", "utf-8", $res));
}