php new self()和new static()，phpnewselfstatic_PHP教程

php new self()和new static()，phpnewselfstatic

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()); // Aecho get_class(B::get_static()); // B
echo get_class(A::get_static()); // A

self 指的是解析上下文，而不是調用上下文。例子裡，self被解析為定義get_self()的A，而不是解析為調用self的Ｂ。

php5.3中引入了延遲靜態繫結的概念，該特性最明顯的標誌就是新關鍵字static。static指的是被調用的類。例子裡B::get_static()將生產新的Ｂ，而不是執行個體化一個Ａ

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