Error

PHP Noticeyii\base\ErrorException

Undefined offset: 2

$_GET = [
    'name' => 'Solutii depistare febra',
    'id' => '359',
    'filter1' => 'producator%7CUNIVIEW%7C27',
    'filter2' => 'Distanta%20detectie%7C1%20~%203%20cm%7C826',
    'filter3' => 'Tip%20dispozitiv%7CStand%7C816',
    'filter4' => 'Detectie%7CIndividuala%7C819',
];