SplPriorityQueue::count()

(PHP 5 >= 5.3.0, PHP 7)

Counts the number of elements in the queue

说明

publicSplPriorityQueue::count(void) : int

参数

此函数没有参数。

返回值

Returns the number of elements in the queue.

After iteration, the queue will be empty. Therefore, `count()` will return 0. You can circumvent this by iterating over a clone, instead of the actual queue.
https://stackoverflow.com/questions/27464012/splpriorityqueuenext-is-removing-the-item