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PHP: array_reduce() function

PHP: Iteratively reduce the array to a single value using a callback function

The array_reduce() function is used to reduce the array to a single value by iteratively using a user-supplied function.

Version:

(PHP 4 and above)

Syntax:

array_reduce(input_array, user_defined_function, initial_value)

Parameters:

Name Description Required /
Optional		 Type
input_array The input array. Required Array
user_defined_function User-supplied function to accept values from the array. Required
-
initial_value Initial value to send to the function Optional Integer

Return value:

The resulting value.

Value Type: Mixed*

*Mixed: Mixed indicates multiple (but not necessarily all) types.

Example:

<?php
function addv($a, $b)
{
$a += $b;
return $a;
}
$z = array(1, 2,3,4,5);
$x=array_reduce($z,"addv");
echo $x;
?>

Output:

15

Pictorial Presentation:

php function reference: array_reduce() function

View the example in the browser

Practice here online :

See also

PHP Function Reference

Previous: array_rand
Next: array_reverse



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PHP: Tips of the Day

Filters the collection using the given callback

Example:

<?php
function tips_reject($items, $func)
{
  return array_values(array_diff($items, array_filter($items, $func)));
}

print_r(tips_reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
  return strlen($item) > 4;
}));
?>

Output:

Array
(
    [0] => Pear
    [1] => Kiwi
)