How to find value by array key?

Question

PHP

I have the key but i need to know the value in the array how to write it. I only know array_search and array_keys but I need to do it in a different order

Answer 1

Isn't that right?

$array = ["hi", "world", "!"];
$i_know_index = 1;

echo $array[$i_know_index];

Answer 2

the question is not clear