Session array accessing on next button click of next button - php

Question

How to get next array element from session array on next button click?
I tried next($_SESSION['qid']) it didn't work
if((int)$_SESSION['qn']<=20) {
$_SESSION['qn']=$_SESSION['qn']+1;
$_SESSION['qid']++;
}
I also tried
$_SESSION['qid']=next($_SESSION['qid']);
But this neither worked. Can someone help me?

Answer 1

_SESSION array is an associative array. You can't access it by numeric index, but you must specify the index name (e.g. in your code, $_SESSION['qid']). Anyway, you can still use next() function, passing the array $_SESSION (see here: http://php.net/manual/en/function.next.php). The correct way to use it is:
$element = next($_SESSION)
you'd likely want to put this code in a cycle.
Additionally, your code:
$_SESSION['qn']=$_SESSION['qn']+1;
means: assign to $_SESSION['qn'] the value of $_SESSION['qn'] plus 1, which is not what you want.
In case you'd want the next element in a NON associative array, you should use:
$arr = $arr[$i+1]
where $i is a integer value.
Update: regarding your comment, why don't you save a regular array (non associative) inside $_SESSION['questions']? This way you'd have the questions accessible this way:
$_SESSION['questions'][0], $_SESSION['questions'][1]...
Now you can use it within a cycle, or whatever you want. E.g.:
echo $_SESSION['questions'][$current_question_id+1];
where $current_question_id would be the current question index, which will be updated (+1) every clic on the next button