Unique entries in an array

Question

I have the following that stores the previous 10 URL\'s into a session:

function curPageURL() {
 $pageURL = \'http\';
 if ($_SERVER[\"HTTPS\"] == \"on\") {$pageU         


        

Answer 1

if(!in_array($CurrentPage, $_SESSION['pages']) {
    $_SESSION['pages'][] = $CurrentPage;
}

Answer 2

Could array_unique be of help?

Answer 3

instead of $_SESSION['pages'][] = $CurrentPage try $_SESSION['pages'][$CurrentPage] = 1

/edit: to keep items sorted, unset first:

 unset($_SESSION['pages'][$CurrentPage]);
 $_SESSION['pages'][$CurrentPage] = 1;

Answer 4

Just after

$_SESSION['pages'][] = $CurrentPage;

you need to add

$_SESSION['pages'] = array_unique($_SESSION['pages']);

Docs are available here

This method requires less processing, as it's a native function. Performing an 'if' on each item in the array could potentially be quite costly.