PHP - Function array_reduce()

Syntax

array_reduce ( $array, callback $function [, int $initial] );

Definition and Usage

This function applies iteratively the function function to the elements of the array, so as to reduce the array to a single value.

Parameters

Sr.No	Parameter & Description
1	array(Required) It specifies an array.
2	function(Required) This a callback function.
3	initial(Optional) It specifies the initial value to send to the function.

Parameter & Description

array(Required)

It specifies an array.

function(Required)

This a callback function.

initial(Optional)

It specifies the initial value to send to the function.

Return Values

It returns a reduced array.

Example

Try out following example −

Live Demo

<?php
   function call_back_function($v1,$v2) {
      return $v1 . "-" . $v2;
   }
	
   $input = array("a"=>"banana","b"=>"apple","c"=>"orange");
   
   print_r(array_reduce($input, call_back_function));
   print_r("<br />");
   print_r(array_reduce($input, call_back_function, 10));
?>

This will produce the following result −

-banana-apple-orange
10-banana-apple-orange

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