声明仅适用，如果类没有实现接口

Question

new A; 

class A {} 

new C; 

class C extends A {} 

new B; 

class B implements iB {} 
interface iB {} // we can even put interface definition after the class 
       // that implements it 

我希望这个代码没有错误工作，而我越来越

PHP Fatal error: Class 'B' not found in ...

有人能解释为什么出现这种情况？它是一个记录的行为？

PS：PHP 5.3.2

PPS：对ideone相同的行为：http://ideone.com/q4cT6A

Answer 1

这是预期在PHP。对不起，答复我也是这样。 ;）从PHP documentation

报价：

Unless autoloading is used, then classes must be defined before they are used. If a class extends another, then the parent class must be declared before the child class structure. This rule applies to classes that inherit other classes and interfaces.