Error

PHP Noticeyii\base\ErrorException

Undefined offset: 2

$_GET = [
    'name' => 'Acumulatori si baterii',
    'id' => '334',
    'filter1' => 'producator%7CBIG%20BAT%7C17',
    'filter2' => 'Tensiune%20(V)%7C12%7C547',
];