ScotlandPHP 2019

SplPriorityQueue::isEmpty

(PHP 5 >= 5.3.0, PHP 7)

SplPriorityQueue::isEmptyChecks whether the queue is empty

说明

public SplPriorityQueue::isEmpty ( void ) : bool

参数

此函数没有参数。

返回值

Returns whether the queue is empty.

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