PHP Ds Deque copy()函数用法介绍

Ds \ Deque :: copy()function是PHP中的内置函数, 用于返回Deque的副本。这将返回Deque的浅表副本。
语法如下:

public Ds\Deque::copy ( void ) : Ds\Deque

参数:此函数不包含任何参数。
【PHP Ds Deque copy()函数用法介绍】返回值:此函数返回Deque元素的副本。
下面的程序说明了Ds \ Deque :: copy()PHP中的功能:
程序1:
< ?php// Declare deque $deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]); echo ( "Elements in the Deque\n" ); // Display the Deque elements var_dump( $deck ); // Use copy() function to // copy the Deque $deck_copy = $deck -> copy (); echo ( "\nCopy Deque elements\n" ); // Display the Deque elements var_dump( $deck_copy ); ?>

输出如下:
Elements in the Deque object(Ds\Deque)#1 (6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) }Copy Deque elements object(Ds\Deque)#2 (6) { [0]=> int(1) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) [5]=> int(6) }

程式2:
< ?php// Declare deque $deck = new \Ds\Deque([ "geeks" , "for" , "geeks" ]); echo ( "Elements in the Deque\n" ); // Display the Deque elements print_r( $deck ); // Use copy() function to // copy the Deque $deck_copy = $deck -> copy (); echo ( "\nCopy Deque elements\n" ); // Display the Deque elements print_r( $deck_copy ); ?>

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

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

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