self::和static::的区别

在阅读一些框架的源码时发现了new static()，和new self()，甚是不解，后来查阅资料，才知道static采用了延迟绑定，能准确知道是父类还是子类的调用。这就是说static是个聪明的小孩，家里的亲戚的辈分他都能准确的叫出；而不是像他的兄弟self，只知道自己的亲爹妈。

例子如下：

classFather{

protectedstatic$name ="father";

publicstaticfunctionwhoami_self(){

echoself::$name."\n";

}

publicstaticfunctionwhoami_static(){

echostatic::$name."\n";

}

publicstaticfunctiongetInstance_self(){

returnnewself();

}

publicstaticfunctiongetInstance_static(){

returnnewstatic();

}

}

classFatherBrotherextendsFather{

protectedstatic$name ="uncle";

}

FatherBrother::whoami_self();//father

FatherBrother::whoami_static();//uncle

var_dump(FatherBrother::getInstance_self());//father

var_dump(var_dump(FatherBrother::getInstance_static()));//uncle