Description:
------------
in php4 array_merge_recursive($arr1,$arr...) allowed the first array argument to be unassigned , in php5 it requires inintialising.

perhaps php4 behaviour was a feature-bug ?



Reproduce code:
---------------
while( $whatever ){
  $arr = foo->get_arr();
  $tmp = array_merge_recursive( $tmp , $arr ) ;
}

Expected result:
----------------
$tmp is created if !exists & continues as expected

Actual result:
--------------
PHP-4.3.8 >> $tmp is created if !exists & continues as expected

PHP-5.0.3 Warning: array_merge_recursive() Argument #1 is not an array in ....

easily  `solved` by initialising $tmp prior to use $tmp=array(); just unsure if this is intended ?