Error

PHP Noticeyii\base\ErrorException

Undefined offset: 2

$_GET = [
    'name' => 'Detectori incendiu',
    'id' => '318',
    'filter1' => 'Detectie%7CFlacara%7C343',
    'filter2' => 'Detectie%7CFum%20si%20temperatura%7C341',
];