WeakMap
PHP Manual

WeakMap::valid

(PECL weakref >= 0.2.0)

WeakMap::validReturns whether the iterator is still on a valid map element

说明

public bool WeakMap::valid ( void )

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.


WeakMap
PHP Manual