PHP Ds\Deque count()函数用法介绍

Ds\Deque::count()函数是PHP中的内置函数, 用于获取Deque中的元素数。
语法如下:

public Ds\Deque::count( void ) : int

参数:此函数不接受任何参数。
返回值:此函数返回双端队列中的元素数。
【PHP Ds\Deque count()函数用法介绍】下面的程序说明了Ds\Deque::count()PHP中的功能:
程序1:
< ?php//Declare a deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]); echo ( "Elements in the Deque\n" ); //Display the Deque elements print_r( $deck ); echo ( "\nNumber of elements in the Deque: " ); print_r( $deck -> count ()); ?>

输出如下:
Elements in the Deque Ds\Deque Object ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )Number of elements in the Deque: 6

程序2:
< ?php//Declare a deque $deck = new \Ds\Deque([ "geeks" , "for" , "geeks" ]); echo ( "Elements in the Deque\n" ); //Display the Deque elements print_r( $deck ); echo ( "\nNumber of elements in the Deque: " ); print_r( $deck -> count ()); ?>

输出如下:
Elements in the Deque Ds\Deque Object ( [0] => geeks [1] => for [2] => geeks )Number of elements in the Deque: 3

参考: http://php.net/manual/en/ds-deque.count.php

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