public function testXKIntersectAcceptsCallback()
{
$xao = new XArray(['x' => 1, 'ab' => 2, 'z' => 3]);
$test = new CallbackTestMethods();
$obj = $xao->xkintersect(['a' => 4, 'abc' => 'xyz'], [$test, 'length_compare']);
$this->assertEquals(['a' => 4], (array) $obj);
}
