Description:
------------
this code gives the impression that array assignment is actually done by pointer sharing, when it should be done by copying.

Reproduce code:
---------------
<?php
//
$master_A=array(1,2,4,3);
$master_B=array(1,3,2,4);
$A = $master_A;
$B = $master_B;
	echo"<br/>BEFORE MULTISORT";
	echo"<br/>master_A<br/>";
	print_r($master_A);
	echo"<br/>master_B<br/>";
	print_r($master_B);
array_multisort($A, $B); 
	echo"<br/>AFTER MULTISORT";
	echo"<br/>master_A<br/>";
	print_r($master_A);
	echo"<br/>master_B<br/>";
	print_r($master_B);
?>

Expected result:
----------------
BEFORE MULTISORT
master_A
Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 3 )
master_B
Array ( [0] => 1 [1] => 3 [2] => 2 [3] => 4 )
AFTER MULTISORT
master_A
Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 3 )
master_B
Array ( [0] => 1 [1] => 3 [2] => 2 [3] => 4 )


Actual result:
--------------
BEFORE MULTISORT
master_A
Array ( [0] => 1 [1] => 2 [2] => 4 [3] => 3 )
master_B
Array ( [0] => 1 [1] => 3 [2] => 2 [3] => 4 )
AFTER MULTISORT
master_A
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )
master_B
Array ( [0] => 1 [1] => 3 [2] => 4 [3] => 2 )