PHP 8.0 正式发布：支持 JIT 编译器，性能提升高达 3 倍

htmlspecialchars($string, ENT_COMPAT | ENT_HTML401, 'UTF-8', false);

htmlspecialchars($string, double_encode: false);

class PostsController{  /**   * @Route("/api/posts/{id}", methods={"GET"})   */  public function get($id) { /* ... */ }}

class PostsController{  #[Route("/api/posts/{id}", methods: ["GET"])]  public function get($id) { /* ... */ }}

class Point {  public float $x;  public float $y;  public float $z;  public function __construct(   float $x = 0.0,   float $y = 0.0,   float $z = 0.0,  ) {   $this->x = $x;   $this->y = $y;   $this->z = $z; }}

class Point {  public function __construct(   public float $x = 0.0,   public float $y = 0.0,   public float $z = 0.0, ) {}}

class Number {  /** @var int|float */  private $number;  /**   * @param float|int $number   */  public function __construct($number) {   $this->number = $number; }}new Number('NaN'); // O

class Number {  public function __construct(   private int|float $number  ) {}}new Number('NaN'); // TypeError

switch (8.0) {  case '8.0':   $result = "Oh no!";   break;  case 8.0:   $result = "This is what I expected";   break;}echo $result;//> Oh no!

echo match (8.0) {  '8.0' => "Oh no!",  8.0 => "This is what I expected",};//> This is what I expected

$country = null;if ($session !== null) {  $user = $session->user; if ($user !== null) {   $address = $user->getAddress();  if ($address !== null) {    $country = $address->country;  } }

$country = $session?->user?->getAddress()?->country;

0 == 'foobar' // true

0 == 'foobar' // false

strlen([]); // Warning: strlen() expects parameter 1 to be string, array givenarray_chunk([], -1); // Warning: array_chunk(): Size parameter expected to be greater than 0

strlen([]); // TypeError: strlen(): Argument #1 ($str) must be of type string, array givenarray_chunk([], -1); // ValueError: array_chunk(): Argument #2 ($length) must be greater than 0