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PHP array_reduce() Function

PHP array_reduce() Function

Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_reduce() Function.

The built-in array_reduce() function in PHP applies repeatedly the callback function to the elements of the array, so as to reduce the array to a single value.


Following below is the syntax to use this function -

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

Parameter Details

Sr.NoParameter & Description


It specifies an array.



This a callback function.



It specifies the initial value to send to the function.

Return Value

This function returns a reduced array.


Try out the below example -

   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));


When the above code is executed, it will produce the following result -


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP array_reverse() Function.

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