Ds \ Deque::apply()函數是PHP中的內置函數,用於通過執行回調函數定義的操作來更新Deque的值。
用法:
public Ds\Deque::apply( $callback ):void
參數:該函數接受單個參數$callback,該參數保存該函數定義要對Deque的每個元素執行的操作。
返回值:該函數不返回任何值。
以下示例程序旨在說明PHP中的Ds \ Deque::apply()函數:
程序1:
<?php
// Declare deque
$deck = new \Ds\Deque([1, 2, 3, 4, 5, 6]);
echo("\nElements in the deque are\n");
// Display the deque elements
print_r($deck);
// Use apply() function to implement
// the operation
$deck->apply(function($element) {
return $element * 10;
});
echo("\nUpdated elements in the deque\n");
// Display the deque elements
print_r($deck);
?>
輸出:
Elements in the deque are
Ds\Deque Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
[5] => 6
)
Updated elements in the deque
Ds\Deque Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
[5] => 60
)
程序2:
<?php
// Declare deque
$deck = new \Ds\Deque([10, 20, 30, 40, 50, 60]);
echo("\nElements in the deque are\n");
// Display the deque elements
print_r($deck);
// Use apply() function to implement
// the operation
$deck->apply(function($element) {
return $element % 10;
});
echo("\nUpdated elements in the deque\n");
// Display the deque elements
print_r($deck);
?>
輸出:
Elements in the deque are
Ds\Deque Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
[5] => 60
)
Updated elements in the deque
Ds\Deque Object
(
[0] => 0
[1] => 0
[2] => 0
[3] => 0
[4] => 0
[5] => 0
)
參考: http://php.net/manual/en/ds-deque.apply.php
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注:本文由純淨天空篩選整理自barykrg大神的英文原創作品 PHP | Ds\Deque apply() Function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。
