Can someone please trace the code and let me know what is happening here ?

$value) { $dest [$key] = $value; }; return 1; }; $a array(1,2,3); $b = array(4,5,6); copy_array1($b, $a); print_r($b); function copy_array2(&$dest, &$src, $amount, $src_offset, $dest_offset) { for ($i = 0; $i