PHP官方也说过，大概意思是说self调用的就是本身代码片段这个类，static - PHP 5.3加进来的只得是当前这个类，有点像$this的意思，static调用的是从堆内存中提取出来，访问的是当前实例化的那个类，那么 static 代表的就是那个类，例子比较容易明白些。
其实static就是调用的当前调用的类，比较抽象吧。
self refers to the same class whose method the new operation takes place in.
static in PHP 5.3's late static bindings refers to whatever class in the hierarchy which you call the method on.
In the following example, B inherits both methods from A. self is bound to A because it's defined in A's implementation of the first method, whereas static is bound to the called class (also see get_called_class() )
<?php
class Boo {
protected static $str = "This is class Boo";
/*
public static function get_info(){
echo get_called_class()."<br>"; //output Foo
echo self::$str; //output This is class Boo
}
*/
public static function get_info(){
echo get_called_class()."<br>"; //output Foo
echo static::$str; //output This is class Foo
}
}
class Foo extends Boo{
protected static $str = "This is class Foo";
}
Foo::get_info();
?>再举个例子：
class A {
public static function get_self() {
return new self();
}
public static function get_static() {
return new static();
}
}
class B extends A {}
echo get_class(B::get_self()); // A
echo get_class(B::get_static()); // B
echo get_class(A::get_static()); // A
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