When array is serialized and unserialized  the internal pointer is not preserved. that means not the exact copy of the array is created.



-------------code-----------
<?
	$array = Array();
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	$array []=count($array);
	print_r($array);
	echo "<hr>";

	next($array);
	next($array);
	next($array);

	echo "before: ".current($array);

	$array_serialized = serialize ($array);
	unset($array);
	echo "<hr>";
	$new_array = unserialize ($array_serialized);

	echo "after".current($new_array);
?>
---------------------------
output :
Array ( [0] => 0 [1] => 1 [2] => 2 [3] => 3 [4] => 4 [5] => 5 [6] => 6 [7] => 7 [8] => 8 [9] => 9 ) 
--------------------------------------------------------------------------------
before: 3
--------------------------------------------------------------------------------
after0