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PHP Ds\Deque pop()用法及代码示例


Ds \ Deque::pop()函数是PHP中的内置函数,用于从Deque中删除最后一个元素(如果Deque不为空)并返回它。如果Deque为空,则抛出异常。

用法:

public Ds\Deque::pop( void ):mixed

参数:该函数不接受任何参数。


返回值:此函数返回从双端队列中删除的最后一个元素。

以下示例程序旨在说明PHP中的Ds \ Deque::pop()函数:

程序1:

<?php 
  
// Declare a deque 
$deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]); 
  
echo("Elements of Deque\n"); 
  
// Display the Deque elements 
print_r($deck); 
  
// last element in the deque 
echo("\nLast element of deque:"); 
  
// Use pop() function to removing last 
// element from Deque and Display it 
print_r($deck->pop()); 
  
echo("\nElements of Deque\n"); 
  
// Display the Deque elements 
print_r($deck); 
  
?>
输出:
Elements of Deque
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
    [5] => 60
)

Last element of deque:60
Elements of Deque
Ds\Deque Object
(
    [0] => 10
    [1] => 20
    [2] => 30
    [3] => 40
    [4] => 50
)

程序2:

<?php 
  
// Declare a deque 
$deck = new \Ds\Deque(["geeks", "for", "geeks", "practice"]); 
  
echo("Elements of Deque\n"); 
  
// Display the Deque elements 
print_r($deck); 
  
// last element in the deque 
echo("\nLast element of deque:"); 
  
// Use pop() function to removing last 
// element from Deque and Display it 
print_r($deck->pop()); 
  
echo("\nElements of Deque\n"); 
  
// Display the Deque elements 
print_r($deck); 
  
?>
输出:
Elements of Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
    [3] => practice
)

Last element of deque:practice
Elements of Deque
Ds\Deque Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)

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



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注:本文由纯净天空筛选整理自barykrg大神的英文原创作品 PHP | Ds\Deque pop() Function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。