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function getClientIp() {
    $ipaddress = '';
    if (getenv('HTTP_CLIENT_IP'))
        $ipaddress = getenv('HTTP_CLIENT_IP');
    else if(getenv('HTTP_X_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_X_FORWARDED_FOR');
    else if(getenv('HTTP_X_FORWARDED'))
        $ipaddress = getenv('HTTP_X_FORWARDED');
    else if(getenv('HTTP_FORWARDED_FOR'))
        $ipaddress = getenv('HTTP_FORWARDED_FOR');
    else if(getenv('HTTP_FORWARDED'))
        $ipaddress = getenv('HTTP_FORWARDED');
    else if(getenv('REMOTE_ADDR'))
        $ipaddress = getenv('REMOTE_ADDR');
    else
        $ipaddress = 'UNKNOWN';
 
    return $ipaddress;
}

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public function index(Request $request) {
    $ip = $request->ip();
    return view('welcome')->with('ip', $ip);
}

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public function index(Request $request) {
    $ip = $request->getClientIp();
    return view('welcome')->with('ip', $ip);
}

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public function index() {
    $ip = request()->ip();
    return view('welcome')->with('ip', $ip);
}

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ʹÓÃrequest()->getClientIp()ÒªÁì»ñÈ¡¿Í»§¶ËIPµØµã£º

public function index() {
    $ip = request()->getClientIp();
    return view('welcome')->with('ip', $ip);
}

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