How can I write in PHP a function that modifies an array?

Question

I would like to have a function that takes an array as input and changes some values of the array (in my case the array is $_SESSION but I think it does not really maters).

Answer 1

The coding is like:-

$_SESSION['index_1'] = 'value 1';
$_SESSION['index_2'] = 'value 2';

If you want to change the value for the index "index_2" to value "value 2 changed", then you just simply write:-

$_SESSION['index_2'] = 'value 2 changed'; 

Hope it helps.