array_merge() no longer accepts non-array parameters to merge.

<?php
    $scandinavia =
        array('Denmark', 'Norway', 'Finland');
    $uk = "The UK";

    $europe = array_merge($scandinavia, $uk);
    var_dump($europe);
?>


strr(i)pos() now searches the full needle inside the haystack, and not only the first character of it.

<?php
    $haystack = "There are now ten more countries in Europe";
    $needle   = "The Netherlands";

    $pos = strrpos($haystack, $needle);
    var_dump($pos);
?>


PHP 4: 0
PHP 5: bool(false)