WeakMap::valid
(PECL weakref >= 0.2.0)
WeakMap::valid — Returns whether the iterator is still on a valid map element
说明
public WeakMap::valid
( void
) : bool
Returns whether the iterator is still on a valid map element.
参数
此函数没有参数。
返回值
Returns TRUE if the iterator is on a valid element that can be
accessed, FALSE otherwise.