$ git diff --shortstat 14806e08 HEAD
11037 files changed, 663672 insertions(+), 270931 deletions(-)

$ git rev-list --count --no-merges PHP-8.0..PHP-8.1
2279

$ git shortlog --summary --oneline --no-merges PHP-8.0..PHP-8.1|sort -r
   816  Nikita Popov
   418  Dmitry Stogov
   172  Alex Dowad
   128  Máté Kocsis
   120  George Peter Banyard
    79  Hao Sun
    42  Anatol Belski
    40  Christoph M. Becker
    36  Joe Watkins
    29  Aaron Piotrowski
    28  Remi Collet
    28  Kamil Tekiela

class User
{
    private readonly int $id;
    private readonly string $email;
    private readonly string $name;
}

enum Suit {
  case Hearts;
  case Diamonds;
  case Clubs;
  case Spades;
}

function pick_a_card(Suit $suit) {}

pick_a_card(Suit::Clubs);

function test($foo = new A()) {}

$fn = Closure::fromCallable('strlen');
$fn = strlen(...);
 
$fn = Closure::fromCallable([$this, 'method']);
$fn = $this->method(...)
 
$fn = Closure::fromCallable([Foo::class, 'method']);
$fn = Foo::method(...);

class Foo
{
    final public const X = "foo";
}
 
class Bar extends Foo
{
    public const X = "bar";
}
 
// Fatal error: Bar::X cannot override final constant 
// Foo::X

class UserServiceTest extends TestCase
{
    private UserRepository&MockObject $userRepository;
}

function neverReturns1(): never
{
    throw new Exception();
}

function neverReturns2(): never
{
    exit();
}

// From undefined
$arr[] = 'some value';
$arr['doesNotExist'][] = 2;

// From null
$arr = null;
$arr[] = 2;


// From false
$arr = false;
$arr[] = 2;
// Automatic conversion of false to array is deprecated

function foo(int $int) {}

foo(3.14);

// Implicit conversion from float 3.14 to int loses precision

var_dump(str_contains("foobar", null));
// Passing null to argument of type string is deprecated
// bool(true)

class MyDateTime extends DateTime
{
    public function modify(string $modifier) { return false; }
}
 
// Declaration of MyDateTime::modify(string $modifier) should be
// compatible with DateTime::modify(string $modifier): DateTime|false