PHP8.0新特性(3) 构造器属性提升 简单写法

PHP8.0新特性(3) 构造器属性提升 简单写法,写法更加简洁，直接定义到构造器传参的参数上了。
新版写法

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

旧款写法

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;
  }
}