Weakref::valid
(PECL weakref >= 0.1.0)
Weakref::valid — Checks whether the object referenced still exists
说明
public Weakref::valid
( void
) : bool
Checks whether the object referenced still exists.
参数
此函数没有参数。
返回值
Returns TRUE if the object still exists and is thus still accessible via
Weakref::get(), FALSE otherwise.