Description:
------------
See reproducer:

Test script:
---------------
$var = function &() {
        $var = [];
        $var[] = &$var;

        return $var;
};

$var = [$var()];

function isref1(array $a, string $k)
{
        return null !== \ReflectionReference::fromArrayElement($a, $k);
}

function isref2(array $a, string $k)
{
        $v = $a[$k];
        $b = $a;
        $b[$k] = $c = new \stdClass();

        if ($a[$k] === $c) {
                $a[$k] = $v;

                return true;
        }

        return false;
}

var_dump($var);
var_dump([isref1($var[0], 0), isref2($var[0], 0)]);


Expected result:
----------------
array(1) {
  [0]=>
  array(1) {
    [0]=>
    *RECURSION*
  }
}
array(2) {
  [0]=>
  bool(false)
  [1]=>
  bool(true)
}


Actual result:
--------------
array(1) {
  [0]=>
  array(1) {
    [0]=>
    *RECURSION*
  }
}
array(2) {
  [0]=>
  bool(true)
  [1]=>
  bool(true)
}