Krava

$res = [];
     
    $arr1 = [ 0=>'Петя', 1=>'Коля', 2=>'Вася' ];
    $arr2 = [ 0=>'100руб', 1=>'200руб', 2=>'300руб' ];
    $arr3 = [ 0=>'Москва', 1=>'Тверь', 2=>'Уфа' ];
     
    $res[] = $arr1;
    $res[] = $arr2;
    $res[] = $arr3;
    print_r($res);