Description:
------------
If you create an array inside array_pop(), expecting that array to be popped then it isn't even though the last element of that array is returned as expected.

Creating the array on the previous line makes array_pop() behave as expected.

This behaviour doesn't occur in PHP4.3.x on FreeBSD. I only noticed it when I upgraded to PHP 5.1.2 on my home WinXP machine though it's possible it was broken but I didn't notice it in 5.0.x

Reproduce code:
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$a=array(0, 1, 2, 3, 4, 5); // Set array first.
$offcut=array_pop($a); // Then pop array.
$length=count($a);
echo	"<pre>Array offcut: "
	.$offcut."\nArray length: "
	.$length."\nLast element: "
	.$a[$length-1]."</pre>\n";

$offcut=array_pop($a=array(0, 1, 2, 3, 4, 5)); // Set and pop at the same time.
$length=count($a);
echo	"<pre>Array offcut: "
	.$offcut."\nArray length: "
	.$length."\nLast element: "
	.$a[$length-1]."</pre>\n";


Expected result:
----------------
Array offcut: 5
Array length: 5
Last element: 4

Array offcut: 5
Array length: 5
Last element: 4


Actual result:
--------------
Array offcut: 5
Array length: 5
Last element: 4

Array offcut: 5
Array length: 6
Last element: 5