Description:
------------
So I have the following

```
<?php

var_dump(array_diff(
    [
        'q1' => true,
        'q2' => true,
        'q3' => false,
        'q4' => false,
    ],
    [
        'q1' => false,
        'q2' => false,
        'q3' => false,
        'q4' => false,
    ]
));
```

Which produces: (https://3v4l.org/WSs2s)

```
array(2) {
  ["q1"]=>
  bool(true)
  ["q2"]=>
  bool(true)
}
```

Which is fine however with just one change it isn't seen. The following produces an empty array yet there is a change. (https://3v4l.org/DlnBr)

```
<?php

var_dump(array_diff(
    [
        'q1' => true,
        'q2' => true,
        'q3' => false,
        'q4' => false,
    ],
    [
        'q1' => false,
        'q2' => true,
        'q3' => false,
        'q4' => false,
    ]
));
```