Description:
------------
When an static array if retourned from a method, for iterating, and acceded with the key() function, the reference pointer is moved to the end of the array.

After the loop, the array is unaccessible.

Important : if you add the following line : 

$tab = testbug::getTab();

before the loop, the error does not occur.

you can use key(), current(), prev(), there is still a bug.

First tested on windows 5.2.5 version, and still present on 5.2.6 version.

There is no bug on 5.2.3 version.

Thanks for answer.



Reproduce code:
---------------
<?php
class testbug
{
	static $tab = array(
		'k1' => "elm1",
		'k2' => "elm2",
		'k3' => "elm3",
		'k4' => "elm4",
	);
	
	static function getTab()
	{
		return self::$tab;
	}
}

var_dump(testbug::getTab());
foreach (testbug::getTab() as $k => $v)
{
	key(testbug::getTab());
}
var_dump(testbug::getTab());

Expected result:
----------------
array
  'k1' => string 'elm1' (length=4)
  'k2' => string 'elm2' (length=4)
  'k3' => string 'elm3' (length=4)
  'k4' => string 'elm4' (length=4)

array
  'k1' => string 'elm1' (length=4)
  'k2' => string 'elm2' (length=4)
  'k3' => string 'elm3' (length=4)
  'k4' => string 'elm4' (length=4)


Actual result:
--------------
array
  'k1' => string 'elm1' (length=4)
  'k2' => string 'elm2' (length=4)
  'k3' => string 'elm3' (length=4)
  'k4' => string 'elm4' (length=4)

null