Clarify the possibility to lose the array pointer with next() and prev()

[tecdoc-ukr]

From manual page: https://php.net/function.next

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If the next or prev function goes beyond the array, it is not possible to return to the previous (first/last element)!

// example
$array = array(
    'fruit1' => 'apple',
    'fruit2' => 'orange',
    'fruit3' => 'grape',
    'fruit4' => 'apple',
    'fruit5' => 'apple');

reset($array); // prepare array

$row = current($array);
var_dump($row); // 'apple'

$row = prev($array);
var_dump($row); // false

$row = next($array); // it is not possible to return to the previous (first/last element)!
var_dump($row); // false