Description:
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This has been reported, filed as closed and in CVS, for more than a year ago. 
However, it is still alive in PHP 4.4.2.

Reproduce code:
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$a = array(4, 3, 5, 2, 1);
$b = array(4, 3, 5, 2, 1);
$copy_a = $a;

array_multisort($copy_a);

print "\$a has changed as well: ";
print_r($a);
print "<BR>\$a should have been: ";
print_r($b);


Expected result:
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$a has changed as well: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
$a should have been: Array ( [0] => 4 [1] => 3 [2] => 5 [3] => 2 [4] => 1 )