PHP Ds Deque find()函数用法代码示例

Ds \ Deque :: find()function是PHP中的内置函数, 用于在Deque中找到元素时在Deque中查找元素的索引。
语法如下:

public Ds\Deque::find( $value ) : mixed

【PHP Ds Deque find()函数用法代码示例】参数:该函数接受单个参数$值其中包含要查找其索引的元素。
返回值:如果element存在, 则此函数返回元素的索引, 否则返回false。
下面的程序说明了Ds \ Deque :: find()PHP中的功能:
程序1:
< ?php// Declare a deque $deck = new \Ds\Deque([10, 20, 3, 40, 50, 6]); echo ( "Elements in the Deque\n" ); // Display the Deque elements print_r( $deck ); echo ( "\nInex of 3 in the deque: " ); // Use find() function to find // the index of element print_r( $deck -> find(3)); ?>

输出如下:
Elements in the Deque Ds\Deque Object ( [0] => 10 [1] => 20 [2] => 3 [3] => 40 [4] => 50 [5] => 6 )Inex of 3 in the deque: 2

程式2:
< ?php// Declare a deque $deck = new \Ds\Deque([ "Geeks" , "for" , "GFG" ]); echo ( "Elements in the Deque\n" ); // Display the Deque elements print_r( $deck ); echo ( "\nInex of 3 in the deque: " ); // Use find() function to find // the index of element var_dump( $deck -> find( "ABC" )); ?>

输出如下:
Elements in the Deque Ds\Deque Object ( [0] => Geeks [1] => for [2] => GFG )Inex of 3 in the deque: bool(false)

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

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