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PHP Ds / Deque redu () function

Syntax:
public DsDeque::reduce ($callback, $initial): mixed
Parameters:This function takes two parameters as above and described below:
  • callable:contains the operation to perform on Deque elements, resulting in one element.
  • value:contains the initial hyphenation value that will be the result after performing the operation on all elements.
Return value :this function returns the final value returned by the callback function.The following programs illustrate the Ds / Deque::redu() function in PHP:Program 1 :  
// Declare deque $deck = new DsDeque ([10 , 20, 30, 40, 50, 60]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// Function for performing an operation in deque $func = function ( $carry , $element ) { return $carry + $element ; }; echo ( " Deque after reduced into single element: " );  
// use the redu() function var_dump ( $deck -> reduce ( $func , 5));  
?>
Exit:
Elements of Deque DsDeque Object ([0] = > 10 [1] = > 20 [2] = > 30 [3] = > 40 [4] = > 50 [5] = > 60) Deque after reduced into single element: int (215)
Program 2:  
// Declare deque $deck = new DsDeque ([10, 20, 30, 40, 50, 60]); echo ( " Elements of Deque " );  
// Show Deque elements print_r ( $deck );  
// Function for performing an operation in deque $func = function ( $carry , $element ) { return $carry * $element + 20; }; echo ( " Deque after reduced into single element: " );  
// use the redu() function var_dump ( $deck -> reduce ( $func , 10));  
?>
Exit:
Elements of Deque DsDeque Object ([0] = > 10 [1] = > 20 [2] = > 30 [3] = > 40 [4] = > 50 [5] = > 60) Deque after reduced into single element: int (8714461220)
Link: http: / /php.net/manual/en/ds-deque.reduce.php

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