Ds \ Deque::find()函數是PHP中的內置函數,用於在Deque中找到元素時在Deque中查找元素的索引。
用法:
public Ds\Deque::find( $value ):mixed
參數:該函數接受單個參數$value,該參數保存要查找其索引的元素。
返回值:如果element存在,則此函數返回元素的索引,否則返回false。
以下示例程序旨在說明PHP中的Ds \ Deque::find()函數:
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));
?>
輸出:
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
程序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"));
?>
輸出:
Elements in the Deque Ds\Deque Object ( [0] => Geeks [1] => for [2] => GFG ) Inex of 3 in the deque:bool(false)
參考: http://php.net/manual/en/ds-deque.find.php
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