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PHP Function array_reduce()

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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. If the optional initial is available, it will be used at the beginning of the process, or as a final result in case the array is empty. If the array is empty and initial is not passed.

Paramters

ParameterDescription
arrayRequired. Specifies an array.
functionRequired. Callback function.
initialOptional. Specifies the initial value to send to the function.

Return Values

Returns a reduced array.

Example

Try out following example:

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

print_r(array_reduce($array, call_back_function));
print_r("<br />");
print_r(array_reduce($array, call_back_function, 10));
?> 

This will produce following result:

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