Ds \ Deque::apply()函数是PHP中的内置函数,用于通过执行回调函数定义的操作来更新Deque的值。
用法:
public Ds\Deque::apply( $callback ):void
参数:该函数接受单个参数$callback,该参数保存该函数定义要对Deque的每个元素执行的操作。
返回值:该函数不返回任何值。
以下示例程序旨在说明PHP中的Ds \ Deque::apply()函数:
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);
?>
输出:
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);
?>
输出:
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 )
参考: http://php.net/manual/en/ds-deque.apply.php
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