Description:
------------
---
From manual page: http://www.php.net/function.array#refsect1-function.array-
unknown
---
<?
$a=array('a'=>1,'b'=>2);
$b=array('j'=>7,'i'=>8);
$b +=$a;
var_dump($b);
?>

Test script:
---------------
array(4) {
  ["j"]=>
  int(7)
  ["i"]=>
  int(8)
  ["a"]=>
  int(1)
  ["b"]=>
  int(2)
}