PHP Ds Deque apply()函数用法介绍 _Deque

Ds \ Deque :: apply()function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。
语法如下：

public Ds\Deque::apply( $callback ) : void

参数：该函数接受单个参数$ callback包含该函数的函数定义了要对双端队列的每个元素执行的操作。
返回值：此函数不返回任何值。
下面的程序说明了Ds \ Deque :: apply()PHP中的功能：
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 ); ?>

输出如下：

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 )

程式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 ); ?>

输出如下：

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 )

【PHP Ds Deque apply()函数用法介绍】参考： http://php.net/manual/en/ds-deque.apply.php