Question

is it correct to unset the session variable for a particular index as the vay whole session is made unset in PHP?

I know this works: unset($_SESSION['bannersize'])

But does this works ? : unset($_SESSION['bannersize'][3])

or is there any other way to unset any particular desired index of the session and then again rearrange the values inside it to remove the empty index..?

Answer 1

If you want to remove an array item and reindex the array, you can use array_splice to do so:

$input = array("red", "green", "blue", "yellow");
array_splice($input, 1, 1);  // removes $input[1]
var_dump($input);