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

is it correct to unset the session variable for a particular index as the vay whole session is made unset in PH开发者_如何学GoP?

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..?

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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);

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I know it is possible to unset a named key. ie you can unset arr['home']['manager']. But i am not very sure about arr['home'][1]. Probably that also should work.