--TEST--
Bug #28739 (*diff() and *intersect() not clearing the fci cache before work)
--FILE--
<?php
class p
{
    public $x;
    function __construct($x)
    {
        $this->x = $x;
    }
}
function a($a, $b)
{
    var_dump(__FUNCTION__);
    return $a->x - $b->x;
}
function b($a, $b)
{
    var_dump(__FUNCTION__);
    return $a->x - $b->x;
}
function main()
{
    $p1 = array(new p(2), new p(1), new p(0));
    $p2 = array(new p(0), new p(2), new p(3));
    uasort($p1, 'a');
    print_r($p1);
    echo "Now diffing:\n";
    print_r(array_udiff($p1, $p2, 'b'));
}
?>
--EXPECT--
string(1) "a"
string(1) "a"
Array
(
    [2] => p Object
        (
            [x] => 0
        )

    [1] => p Object
        (
            [x] => 1
        )

    [0] => p Object
        (
            [x] => 2
        )

)
Now diffing:
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
string(1) "b"
Array
(
    [1] => p Object
        (
            [x] => 1
        )

)