PHP Ds Deque reduce() 函数

Ds\Deque::reduce() 函数可以使用回调函数将 deque 缩减为一个单一的值。

语法

public mixed Ds\Deque::reduce( callable callback [, mixedinitial ] )

Ds\Deque::reduce()函数可以返回最终回调的值。

示例1

<?php 
   deque = new \Ds\Deque([10, 20, 30, 40, 50]);   echo("The elements in deque: \n");   print_r(deque); 

   func = function(carry, element) {      returncarry + element;   };   echo("\n The deque after reduced into single element:");     var_dump(deque->reduce($func, 3)); 
?>

示例2

<?php 
   deque = new \Ds\Deque([10, 20, 30, 40, 50]);   echo("The elements in deque: \n");   print_r(deque); 

   func = function(carry, element) {      returncarry * element + 30;   };   echo("\n The deque after reduced into single element:");   var_dump(deque->reduce($func, 10)); 
?>