Description:
------------
The notes in Example 257 above are incorrect. It states:

If you want to completely preserve the arrays and just want to append them to each other, use the + operator

Check the array type page at http://www.php.net/manual/en/language.types.array.php which states differently. Duplicate keys are ignored with the + operator.

Reproduce code:
---------------
<?php

    $x = array('moon','sky');
    $y = array('rain','shine');

    var_dump($x + $y);
    var_dump(array_merge($x, $y));

?>


Expected result:
----------------
array(2) {
  [0]=>
  string(4) "moon"
  [1]=>
  string(3) "sky"
  ... more values
}
array(4) {
  [0]=>
  string(4) "moon"
  [1]=>
  string(3) "sky"
  [2]=>
  string(4) "rain"
  [3]=>
  string(5) "shine"
}


Actual result:
--------------
array(2) {
  [0]=>
  string(4) "moon"
  [1]=>
  string(3) "sky"
}
array(4) {
  [0]=>
  string(4) "moon"
  [1]=>
  string(3) "sky"
  [2]=>
  string(4) "rain"
  [3]=>
  string(5) "shine"
}