獲取訪問者的 客戶端IP地址

/**

 * 獲取訪問者的 客戶端的ip地址

 */

echo $ip = getIP();

function  getIP() {
    if ($_SERVER['HTTP_X_FORWARDED_FOR']){
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }elseif ($_SERVER['HTTP_CLIENT_IP']){
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }elseif ($_SERVER['REMOTE_ADDR']){
        $ip = $_SERVER['REMOTE_ADDR'];
    }elseif (getenv('HTTP_X_FORWARDED_FOR')){
        $ip = getenv('HTTP_X_FORWARDED_FOR');
    }elseif (getenv('HTTP_CLIENT_IP')){
        $ip = getenv('HTTP_CLIENT_IP');
    }elseif (getenv('REMOTE_ADDR')){
        $ip = getenv('REMOTE_ADDR');
    }else{
        $ip = '';
    }
    return $ip;
}