Accessibility::oneIntervalIntersectsAnother

private function oneIntervalIntersectsAnother($from1, $to1, $from2, $to2): bool
{
	$startsInside = $from2 <= $from1 && $from1 < $to2;
	$endsInside = $from2 < $to1 && $to1 <= $to2;
	$startsBeforeEndsAfter = $from1 <= $from2 && $to1 >= $to2;

	return $startsInside || $endsInside || $startsBeforeEndsAfter;
}