PHP获取客户端和服务器IP地址

/** * 获取客户端IP地址 * @return string */ 

function get_client_ip() { 

    if(getenv('HTTP_CLIENT_IP')){ 

        $client_ip = getenv('HTTP_CLIENT_IP'); 

    } elseif(getenv('HTTP_X_FORWARDED_FOR')) { 

        $client_ip = getenv('HTTP_X_FORWARDED_FOR'); 

    } elseif(getenv('REMOTE_ADDR')) {

        $client_ip = getenv('REMOTE_ADDR'); 

    } else {

        $client_ip = $_SERVER['REMOTE_ADDR'];

    } 

    return $client_ip; 

}   

/**

* 获取服务器端IP地址

 * @return string */ 

function get_server_ip() { 

    if (isset($_SERVER)) { 

        if($_SERVER['SERVER_ADDR']) {

            $server_ip = $_SERVER['SERVER_ADDR']; 

        } else { 

            $server_ip = $_SERVER['LOCAL_ADDR']; 

        } 

    } else { 

        $server_ip = getenv('SERVER_ADDR');

    } 

    return $server_ip; 

}