PHP 8.1.31 Released!

相对类类型

这些类型声明只能在类中使用。

self

The value must be an instanceof the same class as the one in which the type declaration is used.

parent

值必须是 instanceof 使用了类型声明的父级类。

static

static is a return-only type which requires that the value returned must be an instanceof the same class as the one the method is called in. 自 PHP 8.0.0 起可用。

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