PHP 8.1.0 RC 2 available for testing

SplHeap::isEmpty

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

SplHeap::isEmptyChecks whether the heap is empty

说明

public SplHeap::isEmpty(): bool

参数

此函数没有参数。

返回值

Returns whether the heap is empty.

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