php 什么是新静态？
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what means new static?
提问by Hello
I saw in some frameworks this line of code:
我在一些框架中看到了这行代码：
return new static($view, $data);
how do you understand the new static?
你是怎么理解的new static？
回答by Lightness Races in Orbit
When you write new self()inside a class's member function, you get an instance of that class. That's the magic of the selfkeyword.
当您new self()在类的成员函数中编写代码时，您将获得该类的一个实例。这就是self关键字的神奇之处。
So:
所以：
class Foo
{
public static function baz() {
return new self();
}
}
$x = Foo::baz(); // $x is now a `Foo`
You get a Fooeven if the static qualifier you used was for a derived class:
Foo即使您使用的静态限定符用于派生类，您也会得到一个：
class Bar extends Foo
{
}
$z = Bar::baz(); // $z is now a `Foo`
If you want to enable polymorphism (in a sense), and have PHP take notice of the qualifier you used, you can swap the selfkeyword for the statickeyword:
如果您想启用多态（在某种意义上），并让 PHP 注意到您使用的限定符，您可以将self关键字替换为static关键字：
class Foo
{
public static function baz() {
return new static();
}
}
class Bar extends Foo
{
}
$wow = Bar::baz(); // $wow is now a `Bar`, even though `baz()` is in base `Foo`
This is made possible by the PHP feature known as late static binding; don't confuse it for other, more conventional uses of the keyword static.
这可以通过称为后期静态绑定的 PHP 特性实现；不要将它与关键字 的其他更传统的用法混淆static。
