How to set an Arrays internal pointer to a specific position? PHP/XML

Question

Im trying to build a little site using XML instead of a database.

I would like to build a next and prev button which will work relative to the content I have displa

Answer 1

Using the functions below, you can get the next and previous KEYs of the array. If current key is not valid or it is the last (first - for prev) key in the array, then:

• the function getNext(...) returns 0 (the first element key)
• the function getPrev(...) returns the key of the last array element

The functions are cyclic.

function getNext(&$array, $curr_key)
{
    $next = 0;
    reset($array);

    do
    {
        $tmp_key = key($array);
        $res = next($array);
    } while ( ($tmp_key != $curr_key) && $res );

    if( $res )
    {
        $next = key($array);
    }

    return $next;
}

function getPrev(&$array, $curr_key)
{
    end($array);
    $prev = key($array);

    do
    {
        $tmp_key = key($array);
        $res = prev($array);
    } while ( ($tmp_key != $curr_key) && $res );

    if( $res )
    {
        $prev = key($array);
    }

    return $prev;
}